Assuming a repartition of the playerbase similar to the last figures at Japanese prime-time we had before SE removes the server population count, this makes a grand total of around 35k players. And this includes everyone who only connected once to check whether the game was still working or those who bought the game for 10 euros and tried it only 2 days before rage-quitting. This, of course, without any subscription fee.

I am pretty sure the average F2P would be shut down with that population.