I can understand halting trades when the margin calls have caused a significant difference b/w stamp and BFX, but a flat '10% per hour to decline is too much' centralized all exchange halt like a few people here are suggesting sounds ridiculous.
What would you call such a system? 'FinCEN BTC, the first centralized authority in crypto!'
For a number of reasons the idea is nauseating.
I really haven't thought that proposal through, but if it was a good idea, and all/most exchange owners would agree on it voluntarily, then whats so nauseating about it? So long as nobody gets forced to implement these things at gunpoint, and people with a different opinion have the opportunity to start up or use another exchange, what would be the big deal?
However, I doubt a uniform rule like that over multiple exchanges will ever be used in practice.