Probably.
SATA is way slower and takes up possibly more space than an nvme drive
Once CPU and boards have more pci lanes free, you can put more nvme on the board
PC can be smaller possibly as drives are smaller.
I don't know when, I hadn't planned on anything other than nvme on current PC but price made me reconsider.
it won't be any time soon as people still use hdd and they even slower. I can't see SATA ports going away anytime in next 10 years.