I strongly felt this would happen, at the very beguinning (I indeed mentioned). I actually understand the fear of those wishing this site only to be related to design concepts. But it can, as I am seing the very worrying stats, easily end up in nothing due to the lack of afluence, questions, people.
IMHO, and as I understood would have been more practical since an initial moment, there should be allowed any question for just anything 2D graphic making. And keep the closing ratio low, as this highly discourage people in early stages , and don't come back after a closed question that would fall in a bit ambiguous area, according to site scope or description.
The way I see it, you will not loose questions about design theory being asked, or related to design concerns, in general. You will just be adding other questions, that as have been said here, are often of interest, even if not about 'pure' design.
Game Development Stack, in theory (though have been discussed) has a particular problem. It is allowed to answer graphic making questions (I have solved many, there) in relation to game art making. But curiously, their users are so much more of the programming nature that you get a question every once in a big while. The problem is, the users asking those do really need quite some help, but a user like me wont monitor those much as is hard to spot any among a ton of programming questions. (but their scope allows graphic content making questions)
These days, a lot of us need to do some work as well in html/css. And a lot have big troubles in the matter. Stack overflow is a bit bloated of other languages questions, and probably the css questions there go way deeper than what many designers do need when just mounting their design. Webmasters Stack Exchange would close those questions as well.(they actually have a huge field and questions daily, they have no problem). As you probably know, there are css/html job vacants more targeted to the person that also codes in php, javascript, rails, knows pretty well mysql matters, etc. And another profile that would be a designer able to at least mount a basic template of his/her design in html/css.(many of us do so as we want to have better control of the output)
The way I see it: We should allow anything "2D" graphic creation. Because I don't see this stopping design questions appear(specially if you keep the site's name, or a version of it), but more as the way we have to make the site survive...
About areas like sketching, etc, I am answering illustration, wacom tablets questions,etc, which might be not inside the scope (not sure), but come on, for many of us it would have been really useful to be aware of certain tips in some of these areas for our every day work.
There are a lot of computer users that need help in doing a graphic, or are just interested in getting clear a certain concept related to this wider scope, not necessarily even being aware of design per se (or even about what is actually design), but some of us would not mind (to each his own, stack sites are like this, there's different knowledge/expertise areas inside each site's supporting people) to eventually answer some basic questions in that line. The way I see it, we wont get the needed numbers otherwise...
Simply, there is no stack exchange to support this matters, not a single one. This kind of content is left out on all of them, but can be pretty well concentrated in a single site, more about design, and graphics making. (yep, that would mean allowing graphic softwares (and not only Photoshop) techniques, etc)
It is something I have been thinking for a while, not only about this site, but about the main issue for this big area, in all the sites. Grabbing all those users and questions that are not finding a place (and being bounced(often not fairly)) in so many sites, but all can be covered by graphic making (however you prefer to word it), obviously as secondary term to "graphic design" in the title or description...
Excuse the length of this, is noted I started holidays today ;)
EDIT: I certainly would include here as a possibility comics making questions. Probably media and audio would fit better in a successful VFX stack already out there. Which does not need the help of a merge, I think, but not sure. Also, 3D, while I'd love some stack about it (I have experience on design, 3D, comics, graphic making in general, html/css, so I like all these areas) , might as well be out of 2D graphic making scope... Obviously if there is quorum about it, you could make an enormous "media creation" site, which would allow audio, video, 3D. But that is probably carry it way too far...
EDIT 2: Might sound crazy, but I right now I see nothing wrong, and a lot of possibilities in converting it to "Graphic design and media creation". Indeed, proposing to merge with the incoming "3D Graphics Techniques and Software" might be a solution for both(or just opening the scope to 3D), as that one seems to not be taking off... I am pretty aware of the huge user base we'd get related to 3D graphics making...
I don't know. There are many possibilities to not let the site end up here. Whatever the community chooses.