Which will mean it’ll stay irrelevant still.

Irrelevant to whom? The accounting department at my old employer, which uses Great Plains/Dynamics for accounts payable? Next time I'm downtown I'll tell the comptroller that she should get with the program and run AP out of Maria DB.

Which Microsoft is fine with, they bought Postgres sharding company and Azure supports all the popular DBs so they still get their money.

SQL Server is hardly an also-ran.