In many regards IPv6 was a change that went too far and didn't go far enough all at the same time, although slowly but surely it is being adopted. Something like this had a better chance at adoption precisely for how little it changed things. The most radical part is the merging of all services into one central blob and I think that is going to be the part most people take exception too especially oauth. It doesn't solve fundamental issues like roaming with mobile devices, something that now is really important to get rid of a lot of complexity that has built up.