Considering that Disney also owns ABC, I think this raises the chance of some sort of She-Hulk appearance.

Most of it probably is, but the concerns over the fate of the direct market in the USA are real.  Marvel's revenues (not profits) from comic book sales in 2008 were around $290-300 million.  That's not a small amount of money, but it is dwarfed by comic sales in many parts of the world, where comics are accepted as a legitimate literary medium for adults.

This deal should work out well from a movie-making standpoint.  Marvel had struggled with raising money for some of their films, and that will not be a concern once Disney's deep pockets enter the picture.  As I said above, changes to editorial content will be minor and shouldn't affect the bottom line.

But the comic books themselves are probably a small part of the equation for Disney.  And there's a chance that at some point in the future, Disney will decide that the small and monopolized distribution system in the USA is not their best option.  Disney has the wherewithal to distribute their own books if they decided to do that, and it could potentially boost Marvel's global sales, which would be great for Marvel/Disney.  But losing its biggest revenue generator could wipe out Diamond Distributors, the biggest distributor left after the distribution wars that Marvel initiated in the mid-90s.

DC and some of the larger independents (Dark Horse, Image) would probably survive after making some drastic changes.  But the small independents would likely disappear, and that would be a sad day, indeed.

It won't affect Marvel very much if at all. Iger's Disney is very different from Eisner's Disney. Iger hasn't screwed with Pixar much if at all after Disney bought Pixar a couple of years ago (in fact Pixar has released its quirkiest films after being purchased), there's no reason to think they'd do it to Marvel. Disney releases R-rated stuff too (under the Touchstone label), so there's no reason to think they'd dumb Marvel down in any area. In any case Marvel already has a kiddie line, the worst that will happen is that the kiddie line will get a boost in circulation.

She-Hulk should be unaffected too.

What matters down the line is when Iger retires, and if his successor decides to be more hands-on with Marvel. But as long as Iger is in charge Disney shouldn't muck around with Marvel much if at all.

Basically, Disney wants cartoons and movies galore. They don't really care what Marvel does with the print side of things. All this means is that Disney XD will be flooded with new Marvel cartoons a year or so from now. The best-known "free" character is Hulk, so conceivably Hulk could lead the inevitable wave of toons, and that means She-Hulk won't be far behind.

So... like every non-profit company then?

Of course, the issue for Disney - which has prompted a drop in its own share price - is that they're taking over a company that has been whoring out its licenses for some time. So, many of the biggest names are all tied up in rights deals - so, this will not be a quick pay off for them. So... While they wait for that to come through, you never know - stranger things have happened.