On the bright side, room based deployments can also happen with open standards like H.323 and SIP.

https://support.zoom.us/hc/en-us/categories/200110033-H-323-...

I’ve seen multiple large companies swap out their video conferencing system to whatever was the vc system du jour. (Vidyo, Highfive, Bluejeans, WebEx, Zoom) I can’t comment on how expensive it is, but it is a thing that happens fairly regularly.