Honestly probably multiple stages/points of information. Brackets are ties to rewards so add new ones means new rewards structure also.
It's not just about how many are there, but also making a new system that doesnt isolate any particular group too much and swing us towards the other problem when some group faces the same people repeatedly.
There is also some discussion that needs to be around the "why".... many of these players do not face each other at all due to matchmaking.
I'm sure there are other points they discuss too.