I'll also note: AFAIK from discussions with my Google Voice sources over the past year, there are no plans at this time to kill off or otherwise change the ability to run consumer Google Voice on consumer OBiTALK devices. Of course, things can change, but this is the current situation.
BUT: it is worth understanding that Google's primary focus is on their business version of Google Voice for Google Workspace, including continuous improvement of performance and reliability, and adding new features. Consumer GV benefits from the "trickle down" effect. However, with regard to OBiTALK stuff, GV for Workspace uses different Poly hardware, and it is provisioned and managed by a different API between the two companies. It would be a very low priority for Google to devote any time to consumer OBiTALK device use.
I have no inside information whatsoever about what's currently going on at Poly WRT consumer devices.