According to Hub on 670 just now the Mc's have a some family that doesn't make a ton off the team and are wanting to get paid. And that over the last 6 mo's there have been consulting firms in HH, but it's regarding the potential sale; of up to 26% of the team, the Mc's would keep majority ownership.
It would be a start imo. Doesn't sound like there is a lot of interest by the Mc's outside of a handful of Gina's kids, after she finally dies that might create more rifts, which might lead to a slow selling off of the team, which could lend itself to an entire selling.
Must be something going on that the family needs the money.
Generally speaking very rich families typically have this progression: The first generation makes the money, the second generation maintains it, and the third generation spends it all. Virginia is part of the second generation so the kids are the third. It's likely most of them will cash out if given the chance.
NFL teams are worth an enormous amount of money these days because of their limited number. The world is far wealthier than it was even only a couple decades ago but there are still only 32 teams. So anyone ponying up to buy one is going to have to open up the checkbook. It's going to be hard to resist that kind of money.
The McCaskey Family owns an 80% interest in the team with McKenna and Ryan owning 20%. If they were to sell another 26% they would still have controlling interest but would have more voices to answer to.
If I'm correct one single person or entity must own at least 51% of an NFL franchise and I recall there were also some terms attached to the money the NFL loaned on the renovation of SF and if they team is sold that would come due.
Based on this I think it's doubtful we'd see them sell controlling interest in the team now or in the near future. Whatever arrangements they have for passing ownership after Ginny's death have long been in place and are buried in secrecy as far as I know.