The fans would have done no such thing. They’d have complained endlessly and some would have stopped going altogether. Fans don’t give a fig about financial compliance and why should they, it’s not their money?
Fans care about winning and the excitement of following their team. They want their team to be the best it can be.
Under your scenario there’d have been no top five finishes, no exciting runs in Europe, and no FA Cup. If the price of that is a 6 point deduction or a luxury fine I think I’ll cope.