> This "give money and something MAY happen, eventually" model is going to collapse on itself.
I'm not so sure, crowdfunding is certainly very attractive for people that have a track record of delivering but a consumer base that is to small for traditional publishing/production processes. Think Double Fine [1], Harebrained Schemes [2], Order of the Stick [3]. The people behind these projects have a clear, public track record of delivery and the projects wouldn't have happened without Kickstarter's crowdfunding.
There is, of course, also Kickstarter original/official goal which is funding art, but here the same principles apply. With the exception that maybe art backers are a little more accepting of late/disappointing rewards at the end.
The only real question is, is there a sufficient number of such proven projects to make Kickstarter sustainable? I'm not sure, but given the size of the internet and the available talent I would suspect so?
[1] - http://www.kickstarter.com/projects/66710809/double-fine-adv...
[2] - http://www.kickstarter.com/projects/1613260297/shadowrun-ret...
[3] - http://www.kickstarter.com/projects/599092525/the-order-of-t...