It's probably important to note that the AMD64 platform isn't what got Intel in it's current situation. After adopting AMD64 Intel once again dominated AMD and the Bulldozer/Piledrive/Excavator series of AMD processors where not doing well in the competition with Intel.
With Zen AMD once again turned the tables on Intel, but not enough to break Intel. Intels downfall seems entirely self-inflicted and is due to a series of bad business decisions and sub-par product releases.
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