I might have seen around 5 total, on sale across European consumer stores, since they exist.

The fact that many people believed the dream -- including myself twenty years ago -- doesn't make the dream any more realistic. Eventually, people notice that they would like to do more things than their browser allows them to.

So, yes it is true that people have been willing to migrate to cheaper, limited computers (but mainly tablets and phones; not tiny laptops). But those computers are not generally modeled after using the browser for everything.