This isn't the first time this has happened. Remember that little game "minecraft"? The game was effectively developed live while pre-orders were sold that allowed people to play the pre-release code. It raised more money than both of these games before it was released. Enough to create a game company with several employees working on other games as well.

The fact should be firmly established now: it is feasible to bootstrap the funding of games and even the creation of game companies.

Of course it's not going to be easy, and for some people it's going to be harder than for others. But it's always been that way. Making games has always been hard, it's a rather brutal industry that is not very rewarding for most of the people in it.