Well, yeah, there's not really a reason to not, there is an infinite amount of fan art, music, fan fics, etc., and all of it is awesome
And other bronies will continue to make these for many years. Like many other people said, Star Trek is a great example (I myself have not watched any of the older series), people still like it. Also, what keeps the fandom living are its fans, not the show itself, that is just what brought all of us out here to these forums (though the show is still amazing cant wait for S4) So, yeah. I would still be a brony long after the show ends.