In the past the 7 foot players were just big unathletic slow and just sat under the rim to get rebounds and dunks. hence the 3 second rule. Now governments are breeding super athletic versatile 7 footers like KD, Wemby, Porzingus, Lebron, Jokic, Embiid, etc. Do you think in the future most players will be closer to 7 feet tall? Everyone under 6 foot is already being phased out. We will never see another Muggsy Bogues or spudd web ever again. Soon everyone around 6 feet tall will be phased out. When everyone is closer to 7 feet tall will they have to raise the rim to 12 feet?
Players are trending towards average forward size over time. Centers have gotten shorter, guards have gotten taller, and skillsets/positions are starting to blend into each other. I think the big men that remain will trend more towards playmaker rolls over time, since that mitigates the devaluation of height in a spaced floor.