With these new format of FIVB, the continental tournament will become more relevant to their national federation just like in football. I honestly feel that WGP or WL will become fourth tier in importance thanks to this format.
There's no way FIVB is right for giving 12 teams seven years to play in the league. The competition is already drawn out and the top players will get tired so the federation will probably try more team Bs instead of sending their best team. It's not like WGP or WL has qualifications to the WCH or Olympics to make it a must play for everyone.
So in my opinion.FIVB should think about it. The competition will be probabaly low quality. No one wants that.