Well, at some point the governments will actually start doing their jobs and ban IPv4 compatible hardware for sale, just like they did for obsolete analog/digital TV tuners and incandescent light bulbs.
IPv4-compatible equipment is bad because it slows down the transition from IPv4 (aka ARPANET) to IPv6 (aka Internet). Since the free market seems to have trouble to find incentives to do it itself, the governments should force it, in the same way that they forced the transitions from obsolete TV tuners and incandescent light bulbs.