Wild Eyes is pretty much unsinkable. Here is what he posted on SA:

"It would have to be broken up and you would still get floating bits.
The hull is 30mm foam and kevlar/E glass, it has 5 watertight compartments, it has the weight of keel in positive fixed foam additional bouyancy.
She was the best life raft known to man.
Put the fishermen on board, jury rig it and go to perth.
Very easily driven boat. "

Probably better to leave it as is, at least some chance of seeing it or getting a radar return, rather than just leaving it awash. If the Sunderlands want to go on another fund raising mission, I'd prefer they get some funds together to compensate Abby's rescuers, rather than trying to recover the boat Abby willingly abandoned.