I don’t necessarily think Delta views armchair MQM collectors as an issue. If someone wants to sit at home, put a ton of purchases on their DL Amex, and then only fly a few times a year but still be a PM, that is a great bargain for DL.
That being said, I can’t see another 2023 rollover of all MQMs. Rather, I suspect rollover would look like it did PreCovid, and I think most people would be ok with it.