Main TV in our house is 1080p, and it does have a BluRay player connected over HDMI.
Of course most content is DVD, or MP4 over DLNA even through the DVD player.
But that's definitely the "second" source - the Primary source is a NowTV box - 720p output.
Can I tell the difference - yes. 720p -> 1080p is a step. But for the convenience I'll take 720p any day of the week.
Why would I be looking to replace my TV, I already rarely use the resolution it's capable of - let alone buying another TV which I'd never use the full resolution of.
If/when it dies then I'll look at what is on the market, but there would have to be something VERY special to make me change before then.
I'd rather like a multiHDMI monitor with decent speakers. That would attract a premium spend from me, rather than "SMART" apps which I know will never see an update, and which I'll likely never use.