The best realistic case scenario is us getting sold to another super rich family, who clear us of the debt, and instead of the owners taking out 40-60m every year on debt and interest repayments and dividends + 455m debt that is still left, they take out 30m on dividends and spend the remaining 30m on upgrading the stadium, training ground, building/buying a stadium for women's team and on strengthening the 1st team squad.
If I'm being realistic, if we want to avoid takeover by a country who would like to use the club for sportswashing, I've made peace with the fact that they'd want to earn some money for themselves. If someone is investing 4B, and there arent really any more avenues to increase revenue, till there is another technological breakthrough in how football is consumed, which is a few years away at the very least, I don't see the investment being of significant value to them. So the only way is if they take some significant chunks of money to satisfy their greed. As long as they provide what the fans need, I'm fine with it