I thought the OEMs liked the idea of being able to demand high profit margins on RAM upgrades at checkout, which is especially easy to justify when the RAM is on-package with the CPU. That way no one can claim the OEM was the one choosing to be anti-consumer by soldering the RAM to the motherboard, and they can just blame Intel.
OEMs like it when it's them buying the cheap RAM chips and getting the juicy profits from huge mark-ups, not so much when they have to split the pie with Intel. As long as Intel cannot offer integrated RAM at price equivalent to external RAM chips, their customers (OEMs) are not interested.
Intel would definitely try to directly profit from stratified pricing rather than letting the OEM keep that extra margin (competition from AMD permitting).
