People seem to ignore the fact that a downwards population trajectory in an MMO is self perpetuating
You personally may think an exodus is just “clearing out the trash” but an exodus encourages other people to leave which then itself pulls away other people till you are left with basically a hollow core of people who absolutely refuse to give up the game no matter what; basically a RuneScape 3 situation where the game is held up by a core of about 100-200k people who won’t leave the game for any reason and because of it the game doesn’t move very fast
If the game doesn’t course correct the population will dip far lower than just “what it was before the WOW exodus” and then you reach a point where the game may struggle to justify putting out even the meagre content it puts out right now. Are you willing to lose people who annoy you because they complain if it means square starts gutting content. This freefall in population is already concerning enough