MMR should be based mostly on team victories

I know MMR is an individual stat but it's in a team oriented game and I am sick and tired of being left out to dry by people who only want to pad their MMR.If MMR was based mostly on wins and losses instead of kills and deaths there would be no more adc or mids holding their ults till after you die just to get the kill.There will be no more split pushing tier 2 turrets when half your team is pushing the nexxus turrets with a 4v3 advantage when it could be 5v3 and get the win.There wouldn't be anyone refusing to take a turret just so they can keep their lane like they want just to pad their cs advantage when they could take the turret and then roam to another lane to help get another one.There will be no more mids just leaving their lane for no other reason but to get a single kill while their turret is being taken down.

Oh and while I am bitching.Solo queue should be just that,solo not solo/duo.