>>1 I agree with you, though I don't have too much experience with comics and creator controlled/independent comics. I think it's partly to do with the internet: lowering the cost and boundaries between creators and consumers means the traditional publishing company can at times be sidestepped and their hassle and agenda can be avoided, see kickstarter.
That being said Marvel and DC seem to have almost reinvented themselves in recent years with the rise of the movie tie-ins and so still remain relevant. It also is important in the sense that those companies hold a lot of the "golden eggs" of comic characters and it's easier for them to keep on creating stories for them than it is for new authors to convince the world their character's story is worth reading.
So I think for better or worse, the big companies are here to stay. That being said, the small guy is making a waves.