I'd welcome an upgrade in functionality far more than in raw power. A reader properly making use of typesetting features instead of another one doing half of the job, only twice as fast as its predecessor.
From a more general point of view, what we currently get is that computing devices are getting faster, but alas less universally usable. Personally I dislike where this leads to, especially because most of the additional computing power is not used for the appointed tasks but wasted for eyecandy.
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