I hope you're wrong.
The real answer should be world-class broadband, instead of the nonsense we're dealing with now. Full downloads are a bandaid but there's no technical reason why streaming can't work perfectly for the people who want it. Telcos are just lazy and have built-in monopolies.
In the meantime, what you're describing isn't a bad bandaid, but waiting for a whole movie to download just isn't as fun as picking then watching instantly.