I think I made it as a throwaway comment, but now I look again and yes, it's certainly a possibility. After all, do we really care what the operating system is or what it's doing as long as it delivers the goods?
Moving the OS into the 'browser' (which can't really be called that in such a scenario) blurs the line between OS and App so I wouldn't rule out functionally real-time performance being possible. How far forward am I permitted to look?
The concept of a "computer" may itself be only temporary. Some Facebook users think they don't use the Internet; in their minds they've bought a single-purpose appliance. This effective reductio ad absurdum leads to various different types of single-purpose machine, each being a different build of a common platform. Who knows?
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