That's not my understanding.
My understanding is that banks aren't lending due to rules about how much leverage they're legally able to have. I believe US banks legally can only have a leverage factor of 10 (if they have $1B in capital, they can only give out $10B in loans). When their capital shrinks or dries up, as is the case when they have to write off $500k mortgages that are now worth $250k, it causes their capital to shrink and thus they can't loan more without being undercapitalized.
The way out of this problem is to recapitalize the banks to make up for the "credit default swaps" (which were really insurance policies, but not called that because insurance has regulations that the banks and brokers didn't want to abide by) losses and mortgage losses. Paulson's plan of taking the "toxic debt" off the banks books won't work because it's too difficult to figure out what the things are worth. The simplest and most transparent solution is for the USA to buy preferred shares in the banks, directly injecting fresh capital. Once they're recapitalized, the write-downs of the CDS and mortgages can take place over time.
The TED Spread is an indirect measure of non-US-Treasury credit risk. The spread used to be 0.25 - 0.5%. At the moment, it's over 4.61%. Well capitalized banks aren't willing to loan to other banks because if those banks are found to be undercapitalized by the FDIC and/or Treasury, then they'll be taken over at fire-sale prices. The lending bank would then be damaged by the loss. It's not that they're investing in Treasuries instead.
So, while the TED Spread isn't a direct or causal measure, it's a very important indirect indication of what's going on in the credit markets. It should drop quickly once the banks are recapitalized. The destruction of the financial markets will continue until it drops dramatically.
That's my understanding, anyway.
Fallows has some anecdotal reports on what we're in for if lending doesn't loosen up very soon:
http://jamesfallows.theatlantic.com/archives/2008/10/i_wish_we_had.php
:-(
Cheers,
Scott.