I really wanted Spotify to do this. But I'm not going to pay them significantly more money than I do now for the higher res. To be competitive, this should be a null cost or a minimal upcharge. Because of my wife, we use the Spotify dual user tier, so we can each have our own music and playlists. Otherwise, I'd use Qobuz.
They waited too long and missed the boat, I think.
Now that I have tinnitus, I am less worried about fine gradations in sound quality. Their regular 320 bandwidth sounds just fine with my equipment.