Just looking at the history of Intel chips, it's always been the way.
I remember when an '87 floating point co-pro was a very expensive add-on for the '86. It wasn't available on-die until the 486, and even then only on the DX models.
I think DSP type architecture on-die is inevitable. The potential performance gains vastly outway those of using the same real estate on generic cores. We've had a few DSP type additions to the '86 extended instruction set in the past, so it's not hard to imagine.
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