Bulldozer will be the last enthusiast architecture from AMD from the looks of things. They already announced that they are moving away from that market to focus on mobile/low end. The last revision of the architecture is planned for 2015 and after that I don't see them developing a new architecture for high end. Their next architecture will be 100% focused on low power if they last that long.
I am not sure where you got 300w from tho the high end AMD FX-8350 has a TDP of 125W. Tho Intel do still crush them in that regard.
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