Indeed, DRAM and Flash have experienced a convergence - in server and mainframe land there is storage-class memory that functions as a cache or LUT between DRAM

Indeed, DRAM and Flash have experienced a convergence - in server and mainframe land there is storage-class memory that functions as a cache or LUT between DRAM and Flash. I believe we are a bit farther from a true hybrid capacitor. As for true hybrid memory I believe the likeliest solution for embedded applications will be one of the different analog in-memory compute techniques currently being iterated on.