The irony here may be that doing NOTHING will benefit us the most, across the board. I don't see the fundementals applying to a $15K rebate, just the consumerism that we were culturally raised to follow.
Sure as individuals, that $15K is something. Collectively, it's still delaying the inevitable. So, those who have will continue to have, and those who don't can't take advantage of it. Throwing money at a problem with no real practical goal in mind never solved anything of magnitude.
It may well prop up prices and/or allow someone to make 3-6 months of mortgage payments. Then what? Give another borrowed rebate? More of the same will not get us anywhere we need to go, IMO.