I don't know, guys. I like to think I'm a pretty liberal guy, and I read a wide range of comics from from many different publishers, by many different creators in a number of genres.
But, you can count me in as one of those people who want to read about Steve Rogers when I pick up a Captain America comic.
I read (past tense) Marvel comics because I like Steve, Peter Parker, Bruce Banner, Thor et al. I don't care for other characters wearing their costumes, irrespective of gender, race or sexuality.
I would much rather read about a brand new character, in a brand new world, than read about Sam Wilson as Captain America.