FIVB Coaching Commission had a press release on Feb. 15, my highlights of their thought on rules and schedule.
Rule changes or rule modifications to facilitate fan understanding and to improve general flow and delivery of the game
The Commission Members suggested
1) the introduction of quick substitution rules to speed up the game
2) to increase the number of substitutions per set allowing for free substitution of players
3) a review of the net touch rule in order to avoid interruptions that are unclear to fans
4) to continue improving the challenge system operation and to study all issues affecting time duration to avoid over extended matches.
Events calendar planning
Recognizing the need to provide players with enough time for recuperation between seasons, members proposed further work with other Commissions to carry out a review of the current volleyball calendar.
My response to the press release. I would prefer a freer substitution rule, change offense for defense in back row or serving. Going back to the older rule of net touch, where if it doesn't affect the play (not blocking or spiking) it doesn't stop the point. Also, improving the challenge system after we've seen the unnecessary issues, only two challenges, plus a third if correct would be good.
As for the events calendar, it would be good for players to have breaks and they need them. Maybe make leagues only 10 to 12 teams in size. Reduces the number of matches overall, make playoffs at most best-of-3 per round.
Could World Cup be broken into two groups of 6, instead of 12 team round robin? Get done in one week instead of two.
Reducing World League or World Grand Prix to 4-5 weeks length is good (already there)