There will always be budget boards available as that's what most consumers buy, you'll probably have to wait a couple of months though for the B boards and the cheaper non K CPUs as these companies like to milk the early adopters.Motherboard makers will love it. An excuse to stick even more phases and EPS power connectors and heatsinks on their boards.
Top motherboards are already priced 500+. Now the lower tier Z690 will get a big jump in price. Doubt you see many sub 250 boards now, because of DDR5 and Pciex5 and increased power requirements
Its really hard to justify beefy VRM on AM4 boards when even 5950X is limited to 125W.