I have no crystal ball as to the future for MWI; the situation might change if or when Obihai migrates its device firmware from XMPP to WebRTC, but again, I have no idea of the timetable for that.
RE: CNAM, forget it; not going to happen. CNAM is a mess, as an unfortunate but understandable side effect of the deregulation of the telephone carriers, and the proliferation of mobile phones and VoIP DIDs.
In ye olden tymes, pre-divestiture of the Bell System, the various local exchange carriers (mostly Baby Bells, with some independents like General Telephone) had control of their own customers' account information. It was easy for them to build CNAM data bases and "dip" into them to look up names. They shared those data bases with each other. Now, there are many, many providers out there, and the data bases are maintained by not just the ILECs, but by third-party data brokers. Somebody has to pay for that DB maintenance and infrastructure, and it's the telephone service providers who do the feeds of their subscribers, and the lookup dips.
Since GV is a (mostly) free service, Google doesn't pay the providers to be able to perform lookups, and it doesn't provide its users' names to the DBs, either.