as i understand it the big roadblock for multiplayer AAA titles is anticheat, and dont see anyway that changes until linux eats into the MS marketshare (but it should.. linux is a joy!)
Anticheats are anti-consumer; They restrict what you can do on your own machine. It's better not to have these games.
They also make some games actually playable, which is a shame.
Ultimately anti-cheat within the application itself, I find, should be considered acceptable whereas Riot's Vanguard/rootkit solution is an ugly hack. Valve seem to be showing it's possible via both automation (ML) and community judgement to make achieve results - the aim needs to ensure all players look "normal", not stop all cheats (the latter aim is impossible).