I am echoing the idea of another CG, but i think it would be better to replace the 15 teams slot.
I never really got the hype for any form of a Best of x of x. I never got why a budget version of our Classic Playoffs should be a format in a team tour.
I am not a big fan of the SS metagame (which is widely known), but i still think that 2 GC are way too less in any case. WCoP is a great way to explore the metagame with more depth and way faster than it would normally get explored. It would help, since people would have a good reason to build and could prep some techs. The argument, that SS is included in the Bo3o5 isnt really valid for me, since the player has to focus on building for two very different other gens and can't concentrate on building interesting stuff for the CG.
I wouldn't touch SM or ORAS. SM has two very competititve slots, which no team should struggle to fill. PL showed that SM still is many peoples favourite to play, watch and build and that there isnt really a need to shorten the slots. ORAS only has 1 spot, which should be untouchable for the near future.
It also is completely ridiculous to build 45 teams in pools, which you have to do, to be prepared properly.
Have a nice day,
Ink