I am not sure who you mean by "they," but I think it is quite divorced from reality to think that anyone would rather ban Russian ladies from competitions than give them more spots. Unless that was a joke?
There is, in fact, quite a lot of discussion about expanded formats for Worlds, etc., looking to the future. Whether anything comes of it or not, we will have to wait and see.
As for raising the minimum age for seniors to 18, if that happened the greatest immediate beneficiaries would be skaters like Medvedeva ( ) and Tuktamysheva ( ).
Nop. Tuktamisheva needs 22+ age limit. Medvedeva is OK with 20 for Olympics. Zagitova is too young...