I imagine it would be easy enough to - at a discount - sell all the bitcoins to a (single) other party and have them sell the coins over time. Don't know if many entities would want to take such a position, but there are probably at least some.

If mtgox were still operational, they would probably take a loan (in yen) with the btc as collateral, if they needed the amount of money on a short notice (and provided they really owned the bitcoin by that exchange).