I'm gonna get way out in front of this issue and ask now: what happens after the stimulus runs out?

After the artificially boosted spending is gone, will private enterprise (i.e., businesses) and individuals be able to gracefully slide in to pick up the spending that the feds are about to unleash upon the marketplace?

I ask in all seriousness.  If we go and spend all of this stimulus money on things that we need or find useful, that all seems fine, well, and good, but what happens when the spending levels are cut and/or spending is brought back under control -- what will pick up the slack?