My radical ideas:
Eliminate the AL/NL. Move to purely geographic divisions. Have 5x6 or 6x5, either can work.
Reduce the season to 51 3-day series over 26 weeks. Teams get a day off every week. Every team plays 6 scheduled Saturday doubleheaders per year, for a total of 150 games.
Batter may not step out of batter's box during a plate appearance. First violation is a warning and each successive violation is a strike.
Third foul ball after reaching two strikes is a strikeout. No more 5-minute plate appearances.