I don't think that the player count will drop... that would be debatable.. Because the ones don't like those maps with high player number will then also leave...
Nevertheless there's def. players that like that kind of messy games.
Personally I don't like it, and usually I sit out those maps... Also If I play those maps.. Usually people then complain that I'm spamming (like everyone is) just because of my nickname 😉
And you kind of cannot expect anything else other than spam on such conditions.
Having the above said - It's totally up to @snowguy
I like the idea of assigning a lower voting weight depending on the map size vs player count.