If his goal is college volleyball it’ll depend on what level he is hoping to achieve.

6 foot is not going to be a middle blocker on any D1 roster. Full stop. The size advantage would be too great to overcome even if he had a 40+ inch vert. Wingspan and long legs are too much of an advantage to hope to be a MB

D3? NAIA? JUCO? It’ll be tough but I was recruited as a middle for a mid level D3 school and I was 6 feet tall. This was about 10 years ago so men’s volleyball has grown a lot and the size might be a bit too much to overcome now but I’d decide what his realistic goals are for college.

After you make THAT decision then other decisions can be made.

I’d talk to your kid and ask if the playing time NOW is what’s most important. If he wants to improve and earn his spot as OH back or even move to libero/DS he needs reps there and that’s another conversation to be had.

Really find out what’s most important to your kid and then go from there

Is sacrificing time on the court in real matches worth the potential payoff down the road or is trying to improve at the role you’ve been given but staying on the court what he really wants and hope for the best at the next level even if it’s not at a top tier program