I would still say that the real performance bottleneck is ultimately the bandwidth between the CPU and this memory. This suggests that the next stage will be to incorporate heterogenous processors alongside that memory - thus upgrading your computer could then be as simple as plugging in an another combined non-volatile memory/CPU block into a fast inter-connector. Rather reminds me of the the old S100 bus where everything just plugged into the same channel, (which probably dates me quite well).