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You have to realize that your family size is far from the average.
They have to draw the line somewhere and a 6 person family who all share their games is already pretty high.
You say you have 9 people, the next person has 12 people in his household and so on.
The simple fact is just that they cant accommodate everyone with the family share system.
They have to limit it at some point to prevent abuse and to not have the game publishers simply opt out of the system.
Dont forget its 100% voluntary on the publishers part if they add their games to family share.

It sucks in your case but there is just no 100% good solution that pleases everyone.
They could definitely lower the cooldowns to switch family members though, a year is way too long.

I came here to post the exact same thing. I have 6 kids, and I frequently have to do the revoke/re-enable dance when a kid who hasn't played a game in a while decides to fire one up.

Hello, another family with seven kids here, just to remind everyone that we do exist. ;)

Was it our choice to have a large family? Yes. (In our case, we're blended.) It still feels like we're being punished. We all love gaming and to tell us that too bad, I guess we have to pick four favorite kids, is cruel. I'm happy to prove we're all part of the same household. There's enough chaos without adding the nonsense of adding/removing kids from a family (that sounds messed up, doesn't it?) multiple times a day when all the kids want to take their turns on the computers.