Leave the 10 existing worlds the way they are. Messing with realignment or “updating” baseline prestige to match real life performance in the past 20 years is far more trouble than its worth, and would require future updates as well.
If a new world (or worlds) are ever added, there are lots of possibilities.
1) Realigned conferences and divisions
2) Updated baselines (I suggest “floating” instead of fixed)
3) 50-60 year coaching career limits, with a hard reset
4) User initiated relegation - in addition to changing jobs, users could be given the option of replacing *some* sim controlled programs in higher divisions, or more prestigious conferences (those parameters could be under control of admin, so under certain conditions, say major real life realignment in 2024, for example, motivated users could be given a mechanism to facilitate a similar change; where otherwise, the default could be like programs need to fall under sim control for 3 seasons and under C+ prestige to be relegated, for example)
5) Pre-season tournaments - one of the least controversial additions I can think of
But those changes in existing worlds is probably a bad idea. Not that I’m specifically opposed to any of them, per se, obviously. But folks have invested a lot of time (and money in many cases) in the career they’ve built, and the first 3 of above anyway would all be pretty major disruptions in quite a few cases. Opening a new world(s) with some new features like this would be much preferable, I think.