Let's say you're right - that closed systems eventually die - the question is how long is 'eventually'? and when do you act? There has to be a kind of tipping point where your "walled garden" market is declining to the point where it makes it worth opening up and competing on other devices. Now given that KF8 is basically epub with some special Amazon sauce on top you can bet Amazon could release an epub-capable firmware very quickly. Heck, I'd bet they maybe even have one internally. So as soon as they identify that tipping point - and I think we're some way off - they can act very quickly indeed.
One consequence of that might be though, that they decide to stop subsidizing the hardware to sell ebooks. If you're selling a platform anyone can sell to then better make sure you make a profit on that item itself.
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