I dont know if blizzard is up for a mmr reset. I just feel players need an incentive to stop throwing thats why i feel a detailed scoreboard is needed.
Whe you press tab you should be able to see every teammates points, deaths, elims, time spent on fire (mvp), heals, obj time etc.
You should be able to flag players playing consistently bad (you could flag the 5th and 6th players on the scoreboard fot exampel) and if they get flagged for 3 straight matches, insta suspension from comp for 3 hours lol.