That's an interesting question. I have an x470 mlb in my main rig with the 2700x, and secondary rig is an ab350 with a 1700. IF and that is a capital "IF" the next gen supports this mobo and all features, then maybe I keep it. Otherwise it all goes down the ladder of computers. But having thought about that, it would make me a little sad to buy a mlb just for 1 chip and done. Hmmm what other company has made me do that over and over....
But anyway... take the AB350 for example. It will "support" the 2700x with a bios update, but I don't think it supports all the features like PBO, etc.