TV's would be one (of many) limiting factors here. Most consumer televisions have, relative to most other computing devices, low processing power and disk space. Plus you have to factor the additional bandwidth load of downloading a 4K television show that you may not watch and then multiply that cost by 30 or 40.

Yes, it would be like a Netflix box (maybe branded under their Roku brand name) that's similar to Tivo. A Tivo Bolt Premier can be had for $299 with a 1TB drive.

The key is signing a lower cost deal with Verizon/ATT LTE or Dish Satellite to do some sort of the multicast broadcasting similar to Over the Air broadcasting but over the internet. Or do unicast transmissions but during off peak hours and blast it out over the LTE/Satellite network over the span of a week between the hours of 1AM to 5AM. The Netflix Top 100 is probably like 95% of what people are watching.

That way not everyone is congested from 5PM to 11PM every night and the mobile operators have additional revenue from existing wireless/satellite infrastructure.

While technically feasible, content owners won't allow it, so it's a moot point.

Agreed. Caching the video to a Netflix DVR would likely only be guaranteed to work with Netflix's own content. But isn't creating all its own content Netflix's plan?