Are you aware how many Serbs and Serbocroatian native speaking players are out there, of course you’re not, otherwise you wouldn’t say such thing. About 30 millions around the world isn’t to be underestimated.
I know a lot on Xbox alone, on PS are many more.
In Germany the most foreigners after the Turks are from Ex-Yugoslavia with round 2 millions citizens, in Austria Serbs only 300000 (8,7 mio citizens whole Austria), then in Switzerland, Italy Hungary, Australia, Canada…in USA between 700000 - 1 million…do your research. And all the Serbocroatian speaking and even more understanding in Ex-Yugoslavia I didn’t mention in detail. You don’t know what you’re talking about.
Of course if you compare the numbers with other biger countries it’s much smaller. But nevertheless thousands of potential buyers. And if it weren’t so much as I mentioned, so what, why does it bother you anyway, BF1 could bring every single faction of WW1 into the game, and everyone would be happy. No need for every single faction specific weapons (few wouldn’t be a problem neither), just uniforms and voicover commands.
How many Chinese players have you met in BF4? Me none (which doesn’t mean there ain’t none), but from everywhere else I got known with people, and how many Chinese are there in the world? So why Chinese faction is in BF4? See, makes no sense…