Mycanid - I'm sure that tabletop will never die. I certainly hope not.
But, I think that as the technology advances, playing over the internet can be a very good substitute. Particularly for older gamers who don't have the time to hunt down gaming groups. There's already a thread upforum talking about how a guy moving to Ottawa can't find a game. Numerous other people have chimed in to commiserate. I can fully understand that considering that there are no gamers within driving distance of where I live in Japan.
Instead of being seen as competition, it would serve the industry well to support online gaming and to try to bring in gamers that way. Look at the huge number of people who play cards on Yahoo. A game of cards is hardly a difficult thing to arrange among friends, yet, we still see thousands of people playing Cribbage on Yahoo.
Probably the biggest hurdle to online gaming is books. In a TT group, not everyone will own every book, yet, most of the gamers will share their books. Player A buys Supplement X, shows it to his DM and plays his new character. This doesn't work when your DM is on another continent.
I'm not sure how to work around that - perhaps some form of DRM material that is unlocked through the use of the chat platform. But, that, right now, is a big hurdle to get around.
OTOH, it does entice gamers to buy more books as well. If Bob has cool new book X, then maybe everyone else will want to get a copy in the online game since they can't very easily share the book.