It will be utter destruction accross the board, I would feel sorry for intel if they were not such a money grab conmpany
For DIY sure, but AMD already had that segment sewn up from what I've heard for a while.
For OEM systems I think that the situation is a bit more complicated though - with NUC's and laptops or all varieties, especially Chromebooks that AMD is only just breaking into with a generation old APU.
These are the sort of mass sales segments that make a lot from their sheer volume vs the more discerning crowd that go DIY.
It might be a pyrrhic victory to retain market share by offering contra revenue to keep OEM's onside, but I certainly would not put it past Intel to continue doing so until the very dregs of their war chest is depleted, which will be sometime yet - especially as they are still pushing forward with new core designs and decoupling them from process gradually.
Even then there will be a cohort who will still buy Intel simply because of brand recognition, regardless of pricing and the bad PR stories concerning security that we are so aware of as PC tech enthusiasts - my father included who despite having no real reason to upgrade will still blindly buy Intel.