Whether the team is sold soon or not depends on the tax law surrounding amortization of goodwill. Owners are able to take a tax deduction for almost the entire value of a franchise spread over a number of years. Whenever a team is sold, the goodwill resets for the new owner.
If the goodwill reset to the trust on PA's death, the trust now has a multi-billion deduction against again income taken equally over ~20 years. It would actually be a breach of fiduciary duty to sell the team too early if it's tax avoidance value is that substantial.
I'm too lazy to do the research but I worked as a CPA years ago and am pretty sure the tax law still allows the fair market value of goodwill to be added to the trusts tax books and amortized (deducted) over 20-30 years.