I upgrade/update when the previous one dies, still using a Panasonic Viera TH-50PZ85U 50" 1080p plasma from 2008 as the main TV connected to a 7.1 sound system :)
And a HiSense 43" 4k picked up for <200 from CostCo in a guest room.
Both are being fed from Nvidea Shields & Plex so I can cut out...