short term there may be deflation as things are valued to where they should be, and foreclosing mortgages destroy money... but the fed would not let that happen for long.
also the bank doesn't loan out your money that you put in, and you are fdic insured up to 100k anyway. the banks operate on a fractional reserve policy, where they only need to actually have x% of dollars. so say i put in 10 dollars and the reserve is 10%. they can then loan out 90 dollars. of that 100 total (loaned 90 and my held 10) they only need to actually have 10% on hand. when you buy a house they don't give you 250k in some pool of money there; they just give you the money out of thin air because they created it. money was once a store of value, and now it is monetized debt.
I've read that the FDIC only has enough cash currently to cover about 3% of all FDIC-insured funds. (Can't remember where, so that may not be true.) If they were to make up that shortfall, where do you think that FDIC money would come from? Either taxes (bad for you and me) or printed out of nothing (inflationary---and bad for you and me). Honestly, I think a large crisis like I illustrated earlier would prove too much for the FDIC and they would "suspend" payments. Besides, I don't think the Federal Gov. has a very good track record of providing aid to those in need. Just like I'm not counting on getting a Social Security check when I hit 65, I'm not counting on the FDIC to protect my bank account should "Banks 'R Us" go under. Some things in life we can all count on. Is the FDIC one of them?
As far as the rest of your post goes, I don't really see how it is a rebuttal. Looks more like an agreement to me. Debt is issued with the expectation that it will be repaid. When debtors default on a large scale, wealth (debt, actually, but in today's world they are functionally the same) evaporates.
Now, I may be incorrect about the power of the Fed to stop such a spiral. I know that there are safeguards in place, stock trading will automatically halt if prices fall too quickly, etc. Unfortunately, this bubble needs to burst to allow a return to normalcy. Assets are overvalued and debt is over-extended. There will be a recession (it's started already). The Fed is walking a very fine line, because too much interference will postpone the pop and make it worse down the road while too little may lead to panic among investors, creditors, and consumers.
The Center for Economic and Policy Research just put out their report on this whole situation. I recommend everybody read this.
http://www.cepr.net/documents/publications/meltdown_2007_08.pdf