Time limit on 1901 renewals is the end of the month, I will be shocked if you don’t get a call after the deadline passes. Just a gut feeling but I think season ticket renewals across the board will plummet.
I suspect that the cheaper season tickets will sell through no problems but the more expensive ones may struggle to sell through. A crack down on ST sharing isn't going to help, I know lots of people who have shared season tickets with family members and my cousin buys three ST so he can take clients with him. He isn't going to renew.
I don't suppose we will know for sure for a while yet and I suspect some clubs, will struggle more than others.