Over in the Civ3 and Civ4 forums, a sizeable number of active Civfanatics refuse to give Civ5 and Civ6 much of a chance, due to the repercussions of 1UPT. Many of them have indeed made their peace with the "future" of Civ being tied to 1UPT, but not many are happy with that. They may feel more and more forgotten, not willing to give Civ7 a chance either. A small group? Perhaps, especially compared with the Steam numbers for Civ5 and Civ6 active players.
For my part -- since I actively play Civ3, Civ6, and BERT -- my principal objection to 1UPT has to do with pathfinding algorithms. Allowing some stacking so that more units can pass through each other, on the way to where the player wants them to go, will be a gift for me. I will no longer be solving the "sliding tile puzzle" noted by
@aieeegrunt , while I believe that the AI will be much more effective in moving its units as well. Corps and armies are well and good, but they don't address the pathfinding and sliding tile puzzle aspect. If Civ7 has 1UPT, that will be one part of my decision. I have not played enough Old World to comment on how they addressed the pathfinding challenge for the AI or their AI's ability to threaten the human player's cities.