That isn’t part of the plan. The used car market will be glutted with the repossessions that will sell dirt cheap because of the up-front subsidy.
In 2 years a C4C Corolla that was driven off the lot new at $9000, repossessed and auctioned for (maybe) the loan price will be about $4500.
The white house will call it “a wash”!
I made that prediction several weeks ago when the cash for clunkers started.