How would this change the UFC and other MMA organizations? What fighters would thrive and what fighters wouldn't?
Terrible idea which would severely limited ground fighters with less time to work their magic in only a 3 minute rd. 5 minute rds are fine as is.
Looking at the intensity and how a fight goes, shorter rounds are more likely to cripple the fights. I'd rather see the MMA rounds go for 10 minutes or one 20-30 minutes round, as it happened in the early days of the sport. Maybe the kickboxing can go for more than 3-4-5 rounds.