Yes, you are probably right.
Mind you with the way people talk about TB and others you'd think they'd stolen the club from under their noses. There's not many Brighton supporters out there with £200m they'd be prepared to stump up. Although IF or WHEN he sells they'll be bemoaning the new owner!
Is the right answer, the time we need to panic is when he runs out of cash and needs to conduct a fire sale! To be honest though for his investment, say £130m, he's got a Championship club with a large fan base and a shiny new training ground and stadium; most Russians, Arabs or Asian...
Normally, although I must add that very few shareholders agreements are normal, there is a clause addressing debt and death. There would or should be a period within which the club could buy back shares / repay debt, however if there are death duties to pay etc there hand could be forced...