re: Why, has future computing progress ended in 2013 ?
No and that's a problem for Intel. There's no point assuming that tomorrow's Intel chip will compete against today's ARM chips. The ARM chips have plenty of room for easy improvement compared to Intel. Apple is not some special case that can be ignored.
Bay Trail is no competitive knockout and the situation with the 14nm successor will almost certainly be much worse. The big problem though is that far better ARMs will be around starting to compete in the server market now the software offerings are getting fairly complete. What's Intel going to do, offer a cut down Haswell for $20?
Even if Intel were producing something better a point to consider for the ARM ecosystem is that performance is not the most important point. Otherwise ARM would have been destroyed by MIPS long ago. MIPS is a better competitive design for the market ARM is in than Intel and is readily available - and it had 64 bit support ages ago.
And about not paying a foundry margin - of course Intel pays for its foundries and has to do R&D and get profit from them. Costs and the need for profit don't suddenly disappear just because two functions are done within the same company. As to foundries being clueless after 16nm - that is just wishful thinking given the published plans and talks about 10nm.
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