You mean the spike in player count that is already falling off ? (just like every expansion btw, this is nothing new)
https://steamcharts.com/app/39210
It wont take 4-6 months for players to drop off the game, this was a new expansion, people will leave just like they always do, a lot of the players in 14 are MSQ enjoyers which is fine, but they only come back for major patches for the story and that's it, then there are people who lost interest etc etc.
This "massive" spike aint the massive spike you make it sound like it is
I think now is a good time for you to accept that the congestion is done artificially by SE to justify the DC travel locks, there's actually no congestion or barely none.