out of those 20%-50% maybe 5% will actually leave. and those 20%-50% make less than 0.1% of actual enlisted playerbase.
it is a problem if you want historical accuracy. you would still need to have at least 6 (or 8 later this year) separate queues and that is without any game balance.
it is not problem not wanting historical accuracy, it is problem of not knowing how to implement it with current playerbase and implementation of game balance. it is also problem of fixed MM queues vs flexible MM queues.
people who are not mathematicians or programmers simply dont understand complexity and number of players needed to implement historically accurate games with actual game balance. also cause historical accuracy is important you would need separate queues for almost every campaign cause you could differentiate almost every campaign by what weapons they were fielding or not.
it is easy to say “i want historical accuracy”, but nobody is presenting viable solution where you can have both historical accuracy and game balance without requiring order of magnitude more playerbase.