Bolshoi, I'm really not the ignorant one here. With my classes this semester especially, I've gained a very good understanding on how our financial system works. Are you aware that, despite all of this "reduction in the money supply" that the supply of dollars has doubled since the recession? It's set to triple (from 2008 levels) in 2 years I think. And again, I will point out that loans to banks (discount window) is the *Least important* and *least used* of all of the Fed's options. Also, you're ignoring all the money that the Fed lent out in the bailouts that won't be returned.
Let me give you an analogy.
There is this casino on an island. Nobody comes or goes from the island (no planes, boats, trade, etc). The casino lends out bolshoi bucks, at interest, to players. The ones who don't have enough to pay back the loan have to fork over even more of their money, be it credit, checking, etc. This is where you end your scenario. The casino is taking more money than it pays out. However, keep going forward in time. At the end of the month, the casino uses its surplus of bolshoi bucks to pay off the electricity bills, maintenance costs, and salaries. In the end, the casino pays out in expenses almost all of its profit from the loans and casino operations, leaving a little left over to reward its creditors and debts.
What I'm trying to say is money doesn't simply disappear when it gets paid back to the Fed. Additionally, the problems you are putting forth are essentially the problems of loaning money at interest, which is absurd.