interesting post on Kickstarter from Tao, the guy (?) running the game store Starlit Citadel, a Canadian hobby game store in Vancouver. He describes some of the difficulties game stores have in supporting Kickstarter campaigns. Even though he'd like to carry some of the more popular or interesting Kickstarter projects, he can't make it work financially without a fairly generous retailer package.
The only way I think it might work is if he gets a pretty good bulk discount for retailers, and then is able to keep the game in stock for longer than the game is available via Kickstarter. But that's tricky, and maybe not realistic; I bet most Kickstarter publishers produce more than they distribute via Kickstarter, and then he's competing with direct sales (and the much better margins) with the publisher, who's got more room to discount.
I don't think his doomsday scenario will happen (all games funded via preorders through Kickstarter, which would mean that game stores essentially die). Kickstarter folks are generally not expert in distribution (although some are) and aren't in it to sustain a long-term business (Tasty Minstrel would be a counterexample, but they're not typical).