I thought about this a few times but it's not as easy as it seems.
It also adds lot of problems on the business model (it requires to have a hosting that allows for huge traffic to play it from there, also someone getting paid to check it's working, additional licenses, etc etc...)
Plus, yeah, if you play on a computer you have an advantage, trust me. When I do testing from the desktop, I can kill almost anyone flying on a phone. I have dual screen, so I can distinguish those small dots with full detail on the pc
I have to think about it and make a decision, but for the near time i think it will only go for mobile.