This would be a great thing to use with an external display when traveling, but of course it will never happen.
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I've been hoping Apple will get eventually around to work this out, and the article shows it'd be easier than anticipated. I think it'll happen eventually.
As for travelling specifically, it'd be easier to bring a MacBook than to bring a mouse and keyboard and portable display. The display could be replaced by a TV in your acommodation, but it's rare to be able to use that ergonomically.
It'd be instead quite interesting in general for people who already only use little more than the browser.