While AMD makes totally sense for the GPU, about the CPU, even if they ditch the Cell, POWER architecture still remains the best choice. But as a Cell CPU is essentially M POWER cores + N SPE cores (where M=1 for the Cell used by PS3), they could just make a Cell version where the SPEs remain the same as now, just for BC (and also if SW houses developed libraries using them that could be useful also next gen), and just increase the number and update the version of the POWER cores (PS3's Cell uses POWER5+, while current gen is POWER7).
BTW, while IBM stopped the development for its purposes, it made anyway a greatly improved, Double Precision version of the SPE that was high end in 2008 and was used in its supercomputers, achieving great FP performance/power consumption ratio, but it could already have become a totally viable solution for PS4's Cell in 2013, if they choose to upgrade them too.
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