They could, but honestly they should just be more insistent that project founders make more use of the existing tools. They provide a way to say there's a limited number of awards available at a given tier; if you're not going to be able to scale past ten thousand quickly, then don't let more than ten thousand people sign up to receive the product - at least not from the first round.
It would perhaps also drive up orders early in the cycle, as people can't wait until the last few minutes when they see a project has been funded.
Personally I think the simplest option would be allowing a 10% "overshoot" fund, and beyond that the project automatically closes to new backers - this should ensure that despite the various reasons why the money wouldn't come through from individuals (credit card rejected, etc), a funded project would get it's full amount.
