Comment Re: To answer your question (Score 2) 279
They tried that with the Itanium and it did not go well.
What Intel might do is faze out older parts of the ISA like the 16bit x86-x286 instructions to free up some space on the die. Even that might not be worth the effort since I am pretty sure those are already "emulated" on modern CPUs in the decoder.
I thought that it would a good idea for Intel to go only 64 bit on their mobile chips. They have no real installed code base in mobile to worry about.