So that I can stay within a few pages of people (I'm never going to be on teh same page as you guys), we are only talking about HEDT/DT chips, right? Not the later Zen Cores meant for enterprise/servers?
While I love this as a consumer, I don't really like those prices for AMD. Recall that during those generations when AMD was winning the uncontested performance crowns, they did have the highest-price chips. If they are competing within the same level here, I can't see AMD justifying a 50% price cut on relative same performance--not for the high end top binned core. If the 6900K remains at the $1-1.2k price, I think AMD needs to price that competitor at a minimum of $800. Enthusiasts in the market for a 1k chip anyway are going to spend $800, or $900. Not a problem, and AMD needs that cash. Honestly, while it is good to see 8 cores going mainstream, I think that segment really should bottom out in the ~$550 range. I think the 6 core chip should be the mainstream high-core consumer chip. I like your $250 price there, maybe $250-300.
$150 for the 4c seems like a legit AMD price.
Either way, assuming they get perfect yields and binning within those yields, AMD would do extremely well at those price points, of course also assuming this performance is very much real, and the early notes of a rather disappointing KabyLake (same performance, 10W less) are also true.
AMD has a brand problem for many people. Even if they beat Intel by 5%, they could not charge the same as Intel. Intel is seen as a premium solution in the CPU world and AMD is not. For AMD to charge as much as Intel, they would have to beat them by a large margin. If AMD can string a few wins together, they can start to creep up their price, but if they do it too soon they will cut into their sales. If I were AMD, I would focus on getting more market share and lose a little margin on the desktop side.