Is the purpose of the reboot solely to bring in more readers?
Or is the reboot a chance to realign the superheroes and bring them to the modern age of comics as well as the other media. If DC never removed Superman's trunks would hardcore fans be less likely to accept man of steel outfit? If DC never removed Superman's trunks and let MOS's outfit also have trunks, would the general audience be ready to accept it?
Not to mention WW's pants.
I think the reboot in general wasn't just about the costume, but to reinvigorate the whole line, make stories fresh, make the superheroes young, align them with how the media would likely portray them. Face it, comics doesn't earn as much as before, the real cash cows are the TV shows, movies, videos games and etc. If DC did not reboot the line and forced it into our throats, how would the general media be able to successfully adapt and update the characters? We can't expect Green Arrow to be wearing trunks on tv now can we.