"We have now run out of IPv4 addresses"
And ? Do the existing IPv4 addresses risk rusting out, or fading away ?
No, they don't. Whatever IPv4 addresses we have now are perfectly fine, thank you, and will continue to be so for millennia to come. They just might outlive the Human race, actually.
If IPv6 hadn't been artificially complicated in an engineer's fevered dream, there would have been no problem to go to IPv6. Just tack on four more bytes, and consider that the existing IPv4 space was simply 127.0.0.0.x.x.x.x and that would have worked fine and everyone would have understood.
But no, that was too simple. So they made IPv6 a monster of a thing that only network engineers can understand, and now it's languishing in adoption hell. Cry me a river.
Besides, what is RIPE crying about ? Now that IPv4 addresses no longer exist (again), new addresses will have to be IPv6, so where's the problem ? It's upgrade by restriction. RIPE should be happy.