I think the biggest concern is getting all participating instances to agree on how to handle the issue.
We’ll start to see more fragmentation of the Fediverse as different instance owners have different views on what should be done. But many of the measures to fight this will only work if all participating instances do the same, whether actively, or by using a new version of the federation standard. Some instances may think the way is to be more transparent, while others may think the way is to obscure the votes more. Now you’ll have the “transparent” fediverse and the “obscure” fediverse with fundamental disagreements with each other on the way things work.
It’s interesting times ahead. Personally, I don’t think federation is the simple answer to all our social media woes like some folks around seem to think. There’s a lot that needs to be addressed, which will be uncovered as more companies like Meta try to get in on it.