"there'd be no license transfer of any sort, which means that any purchases made on Stadia would effectively be nullified as the service closes down." It lasted less than three years and will leave players with nothing to show. This is what people were predicting when Stadia lauched and part of the reason why it had poor adoption.
It is highly unethical to take away copies of the game that players had to pay full price for. Stadia owes them a retail copy of the games they purchased.
No way the gaming community would be opposed to such a thing.