[2019] Update is great but what about Gatekeepers and Matchmaking?

I am afraid because my PB is 4630, so if I reach league 3 to never come back down, I will be forced to play with max players and even if I lose and will never go back down to play against level 12 players like me.

Trophy droppers will stack at 4600 to make a bigger Gatekeep that will make my life even worse.

I don't know if this will make my progress better, I fear not. They did't say anything about matchmaking so I assume I will have to play on level dissadvantage for a long time now.