As I said, if you assume we're down without significant investment, then the fact that it's simply not worth it. Take Juke as an example, let's say we can get £2m for him now, or we can hang on till the summer when we are a L1 club and he wants out, plus he's in the last year of his contract. Then we get what? £1m? £1.5m? We (SISU/Hoffman/Sultan of Brunei) have lost £500k for no reason.
At this point only a City fan would buy the club. Even if we put £10m in this season, there's no guarantee we'd stay up, and we'd be paying inflated January prices anyway. Then next season we have another hard slog in the Championship where anything can happen.
However, the smart money waits until the summer (or preferably just before). Buys a L1 club on the cheap, has all the deadwood gone and can spend relatively little to get a (relatively) successful side. We have the double whammy of new owners and a promotion season to boost crowds, and spend the real money next year on the crest of a wave.
Put simply: would Southampton be top of the league if they had started rebuilding in the Championship, or has the time in L1 enabled them to add cash to the momentum of promotion to give them a fillip?
EDIT: By the way, I should point out that I'm talking hypotheticals here. I genuinely don't think a takeover will happen at all.