i think if anything, comics in general are just going to get more popular. i mean, webcomics are gaining more and more notoriety, and with every passing year it's only going to become more so. with social media sites like twitter and facebook being so popular, webcartoonists are able to access people who might otherwise not know about webcomics, or webcomics other than Penny Arcade or Control Alt Delete, etc. with advertising sites like Project Wonderful, i think we're more able to reach these people and show them the magic around digital publishing.
now, i honestly don't really believe that print will ever be dead. is that a fact? of course not. it's very possible. obviously there has been a decline in the past 20 or so years in sales, due to economy and loss of interest. but with graphic novels getting made into movies (i.e: Scott Pilgrim, Kick-Ass, Wanted, etc) comics are garnering more attention from people who might otherwise not know that there are other comics besides superheroes. i think at least for the next 10 to 20 years, we'll see increases in digital publishing, with things like Comixology existing, making downloading and reading comics simple, here at Tapastic for simplifying it for webcartoonists, and it's just limitless. for the most part, most webcartoonists goal is to get their comic in print. most of the ones i talk to have that as their end game. there's something about seeing your work printed on paper, holding it in your hands, there's nothing that can beat that.
digital is convenient and easy to access, you don't have to even leave the house to buy a comic anymore. however i don't see it completely killing off print.