I don't know if that is true. Everyone I know with a smart TV uses some other device hooked into it (roku, apple tv, video games) to run the actual streaming apps because the TV hardware is so poor. If they could buy a TV that's just a TV and pay a little less to not have those features they aren't ever using, they'd probably do it. Most people just care abut whether a TV is a certain size and only gamers really care about 4k. If you cared about 4k for movies you wouldn't waste that resolution on compressed streaming content; you'd probably have a small blu ray collection.
Aside from a few Apple TVs I don't know many people who do that, especially not Roku which I presume is some American thing, but I know a lot of people who use the apps on their Smart TV. The rest are hooking up the TV to their computer. I also know a lot of people (me included) who wants a 4K TV just to watch Netflix in 4K so I don't think that's generally true. Don't know anyone who uses Blu-ray.
