This is not like pc, tv support timing out: those items continue to
operate as they did when purchased, only there may be a succession of
products upon which the aging hardware may underperform, or fail to
operate in concert.The Nest obviously still ...
Speaking from 3 days till expiration: there is NO reason to abandon
support of in-home WiFi functionality except to exploit their ability to
implement planned-obsolescence on their customers. I repeat: NO REASON.