What incentive does the lender have to ever denominate in fiat instead of BC2? It would only be used against him.
Then lenders would quickly switch over to denominating all loans in BC2, which would help the new currency to more quickly gain acceptance!
That's quite a commitment. I'm still primarily a Bitcoin user, but what if something better comes out?
Yes, that's a big problem with Bitcoin - there's absolutely nothing to prevent people from switching away from it in droves as soon as something better comes along. The fact that a mass flight away from it is possible makes it a very risky investment.
Whereas, with the contractual agreement regarding BC2, even if people switch away from it, they have to still keep accepting it for at least a certain minimum value. Kind of like how $2 bills are no longer made, but they are still legal tender (and still worth at least $2).
I'm not disputing that having people locked into it, even if obsolete, would keep up Bitcoin prices. What I'm not seeing is an incentive for individuals to opt in and be forced to subsidize those prices no matter what. It's scary. You first.
Point taken. But, if there were some way to declare, as a community, "After such-and-such date, only people who agree to such-and-such price floor will be allowed to continue to use Bitcoin AT ALL going forwards," that could be a good thing. Everyone who thinks that Bitcoin should grow would then be forced to put their money where their mouth is. Put up or shut up.
If no one agrees to take that risk, then Bitcoin will die, but at these prices, one could say it is dying anyway (in that the total value of all Bitcoins today, at this price, is only a tiny, insignificant fraction of the world economy, and declining).
One way to implement such a declaration would be if bitcoin.org distributed a change to the reference client to cause it, after a certain date, to only approve a transaction to or from any address if a contract agreement (agreeing to a certain minimum price floor, or higher) that is digitally signed by the address's owner is on file (included as an attachment to the transaction). If the major pools adopted this protocol change, it would become the new de facto standard for lengthening the block chain, and so effectively Bitcoins would become unspendable by anyone who didn't agree to the new contract.
However, the signed contract would only have teeth, legally speaking, if the address was traceable to a real-world identity - so the contract would have to include real-world contact info.
Of course, this would kill whatever shreds of anonymity Bitcoin has left, but such a sacrifice might be worth it to help Bitcoin expand from the tiny status it has today into a true global phenomenon.