By using Kickstarter project creators are bound to their terms of service, including (and I quote):
Project Creators are required to fulfill all rewards of their successful fundraising campaigns or refund any Backer whose reward they do not or cannot fulfill.
The question is, If they don't, are kickstarter themselves are under any obligation to fix it? Or is it up to you to sue the project creator?
It's a very public way to screw up if a Project Creator does fail though, just avoid any projects started by anyone called DOOMY! You know it's wise.