Eh, the market will adapt.
I’ve been looking at components on AliExpress. Even now, there’s lots of X99-based motherboards with LGA2011-3 sockets that can take both regular DDR4 and ECC DDR4.
But the descriptions are quite hard to understand, and they are apparently quite picky about which RAM will work with them.

I could get a combo of that motherboard with 2 Intel Xeon E5-2680 V4 CPUs (2.4GHz, 3.3GHz turbo, 28 cores, 56 threads in total) (hey, a dual CPU motherboard) for €120. And it’s got 8 RAM slots. So 32GB just with cheap 4GB sticks.