They use Amazon EC2 C5 Compute instances which max out at 144GB.Really? That's interesting - because even on beginner-tier servers you can shove a couple of Tb of sticks in - and even in the most wasteful way possible you could "give" 128 players 16Gb of pool each, which is likely to be greater than or equal to local pool.
When Sean Tracy was saying RAM was an issue, it was in the context of dev's running a server locally on their PC. So not entirely clear that the servers are running out of RAM or if it is a combination of all the objects and the ability of their code to multi-thread.
Microtech is scheduled for end of this year would be the next big increase in content. It's on the roadmap, but nothing about Server Side OCS/ Server Meshing / Server Persistence is.