Multiple ISPs in my country have already deployed IPv6 with NAT64 support, and with CLAT support now available, I think IPv6-only networks will be the next step for most ISPs.
Modern operating systems will gladly do CLAT, and old operating systems (or fussy users) can still get their IPv4 by just ignoring the new DHCPv4 option. But admins can finally stop keeping an IPv4 around for every potential client as most applications and users really don't care.