The performance difference between the two is in many cases not that great (of the four tests done in the AT review the perf differences were 31%, 11%, 0%, 43%). There are now or very soon will be A15 SoCs with double the core count and up to 11% higher clock speed. In ~1 year (give or take a few months) there will be A15 or possibly even A57 SoCs on TSMC 20nm, that will probably increase the peak clock speed of offerings.
So I think your claim that this Chromebook will be faster than any ARM CPU for some years isn't very reasonable... That doesn't mean that this particular CPU isn't terribly artificially restricted, so please no one start an argument with me about how you could just use a better Intel CPU, that isn't the point