It's possible that over the long term it could be backed up via torrents. However, in the short term the only way to save the archive is for IA to sell it. I hope they swallow their pride and do so.
It would be helpful if IA published Wayback data files over torrents, alongside cryptographic signatures of the files (for attestation and provenance purposes, as Wayback data has been used in legal proceedings and you would want that trust in the data maintained regardless of where the bits were retrieved from for hydrating the WARC client side).