If we assumed a base attendance of 10,000 at an average of £10 (which was about what the average was at Ricoh) then that's around £2m of income, that's after deducting an estimated Ricoh rent and match day charges of £300,000.
Add to that any sponsorship, tv money, cup games. If any other company thought they could keep costs below that total then they may well be interested in being Plan B.
Obviously this all assumes that they don't need to buy the club from SISU at a ridiculous price, and that they don't bother spending millions on buying the freehold.
SISU will be around until at least the JR outcome, and after any appeals, so we don't need to worry about Plan B just yet.