I share 4 seats with a group of 8 people (for the last 25 years or so). I go to about half of the games for 2 seats. I am the person whose name is on the account.
I would cancel season tickets if the Jazz traded for Simmons (unless it's for lower-bench players which wouldn't happen because of salary match) and maybe for Westbrook. I mean I can't just cancel because of the people I share with, but I would see who I share with wants to take over the account and bow out next year.