Lordy mercy, here comes Mercy.
Don't play overtime...especially the way the colleges do now. It is ridiculous to keep playing score after score after score...get rid of that rule where you get the ball on the 25-yard line. Play a regular football game.
If you do, just play one 15-minute overtime...and no more.
If you play pro, give both teams a chance at scoring...no sudden death...and play only one 15-minute overtime max.