Come on, think about it. It would cost a LOT of money to demolish the stadium if that is what you mean.
It would cost a LOT of money to do ground works including remediation.
It would take a LONG time to get planning, and there is no assurance that they would.
It would take a LONG time to draw up plans in any case.
The residential market is awful at the moment, especially in such a location.
Do you think a property developer would even think about working the numbers?
I don't. Unless you mean someone else buys the stadium and the developer gets the land around...