First off, I'm totally willing to make a comic for this.
I've seen quite a few attempts at this kinda thing both on here in the past and on the Sweatdrop forums; It seems the biggest problems with these kinda ideas is really lack of exposure and the lack of funds comming in. Just like how video game magazines rarely show indie games, making a magazine by and for people who aren't making alot of money is kind of always going to be a hard sell. It doesn't exactly help that magazines as a medium have been slowly melting away since the internet started to become popular.
So, with that in mind, maybe I'd suggest looking into article-themed website ideas, too? Like how Cracked is run in concept. Or maybe a more fan-orientated version of Anime News Network?... Don't mean to back seat drive, but it does seem like there isn't anything like that at the moment... Well, not unless you include Manga Tutorials itself. :p
Of course, if my suggestion is ignored I'm still fine with supporting this either way. It was just an idea.