MLB
Should get one challenge per game for any call (not ball or strike).

NFL
Take out basically every rule they put in since the Goodell era began.

NCAAF
One foot in bounds, knee down play dead still make no sense to me.

NCAA Hoops
Shot clock bumped down. I don't care 35 seconds is way to long to hold a basketball without a shot attempt.

NHL
Overtime period should be 10:00.

NBA
That new arguing rule really sucked last year. Too many T's when refs egos got in the way because of it.