Unfortunately the price expectation of X570 has been set so it won't come down.
Part of the reason X570 was so expensive is because of the ridiculous amount of PCIe retimers used to maintain signal integrity. Now compare X570 boards to Threadripper TRX40 boards: more PCIe slots, more lanes, more memory, bigger socket, more I/O, still PCIe 4 and...similar price? TRX40 apparently is much better engineered to do away with the expense of PCIe retimers, so the money went into HEDT-class IO and all that jazz. Now, Asus et al can translate that PCIe engineering into refreshed X570 boards to make them better and cheaper to produce, therefore costing less.
But they won't cost less, of course, because the old tat already set sky-high prices (and pushed B550 up as a result), so straight away there's some massive boosts in profit margin.