I don't want to take away their chance to win football games or make the playoffs and I don't want to punish any individual unless it can be proven that they were involved with the exception of one guy: Robert Kraft. He needs to be hit in the wallet hard to incentivize him to end the cheating once and for all. 2 years loss of all revenue. That works out to about 1.2 billion dollars.
He'll either have to keep the team afloat out of his own pocket or sell it off at a loss and step down as GM. Next "incident" is 3 years.