Your post is badly named, as it doesn't seem to invite general discussion about how to popularize LW, but just ask for the evaluation of a specific idea, the webcomic idea.
So here's my evaluation thereof: No, at least not in the way you describe it.
I wonder if a web comic drawn by the regulars
Can you give me even a single example of a webcomic drawn and written collectively that is any good? Even stick-figure comics require a consistent style, both in art and in writing. Comics seem very low on the totem-pole of things which people can work collectively on.
So, no. If the LW community is ever to do a collective effort at something, I hope it's in some endeavour where collective efforts have actually had a chance of working.
Can you give me even a single example of a webcomic drawn and written collectively that is any good? Even stick-figure comics require a consistent style, both in art and in writing. Comics seem very low on the totem-pole of things which people can work collectively on.
If you consider the daily top reddit ragecomic as a webcomic of sorts, then it's one of better quality than many "normal" webcomics (and better than shminux's), and is the product of many many people voting together - some make comics, some vote on comics to increase the accuracy...
People have been asking this question here a lot lately (not sure, why, but still). MoR has been by far the most effective ad for LW so far, but this is a one-man effort. I wonder if a web comic drawn by the regulars based on, say, recent posts and comments would be another way to get people interested. Just to set the bar really, really low, here is my quick impression of this post (the idea is stolen from #lesswrong, but the obvious bad pun is mine):