Well, everything has positive and Negative facts.
As we already know that 50% of mta players are annoyed by their FPS. they don't have fast computers to run MTA on high graphics and I am sure they also need Good android mobile to run mta too and "good" android mobiles are expensive. So they wont bother to waste money on android mobiles to play MTA, they will try to get extra Ram and graphic cards to run MTA/GTA better on big LCD/Monitor.
So, I think. If somehow MTA developers make MTA for android then only few people are going to play MTA on mobile. maybe 10%. people use Mobile to contact each other not to play heavy games, which android mobiles consume much battery while they are playing a normal game "Angry birds". .
I hope you guys got my point with my bad grammar.
Thanks.