No, we absolutely, totally, completely, unconditionally, unambiguously get it. You want to use Google Voice for your home telephone service. You aren't interested in paying anyone for telephone service, or at least not in paying anyone other than Google.
There are hundreds and hundreds of civil, and not-so-civil posts over on the Google Voice forum about this; it's been discussed and debated ad nauseum. Facebook, Twitter and Google have created a fantasy that internet-based services are free, and people get mad when they discover that the services are not free, and they are not the customer. You DO know that you are paying for it today, by letting Google data-mine and sell your online behavior, right? The "customer" is the advertiser, not you. That revenue stream assumes that Google or any of their competitors actually CAN get something of value from your online behavior. They get nothing of monetary value today from OBi / GV users, other than the caller IDs and locations of the numbers, and the contents of transcribed voicemail messages.
Google isn't, and has never been, a telephone company. They aren't interested in the land line business, advertising-supported, or otherwise. There's insufficient money in it to be worth the support headaches, and its use is rapidly declining. The OBi device's use of XMPP to access GV was an unauthorized hack; Google has made a business decision to close that hole, and their stated direction is Hangouts, used within their own Google ecosystem. Having some little software-powered gizmo, into which you can plug an analog RJ-11 telephone jack, to make and receive phone calls, is a "been there, done that" product called MagicJack. MJ couldn't make it work with ads; people won't stand around watching ads while they talk on their cordless phone. It's a nice idea, but it has a low likelihood of happening.
There will be all sorts of hacks and procedures to feed calls indirectly through Google's infrastructure. If any of these appeal to you, great, enjoy, but don't hold your breath waiting for an elegant, Google-powered solution.