That is I guess at least theoretically possible but objectively not currently happening and miners have every incentive to include them as they can extract extra revenue from the MEV opportunity this presents. In order for that to theoretically happen you have to assume every miner will be economically irrational. Most miners and thus most hash rate currently accept out of band transactions. There are collective out of band systems like the mempool accelerator and mining pool specific ones such as those by Mara and ViaBTC.

We also should not root for a world where miners can band together and block transactions as that means uncensorable money is gone, and that’s the whole premise of BTC. If miners hate me for whatever reason and can band together to block my transaction, then BTC has been rendered pointless. This is the very foundation of freedom money.