Sure, but that's a latency thing, not a BW thing. You won't need 7 GB/s, just 2 GB/s and 10 us latency...sort of thing. The finer the granularity, the more reliance on low latency rather than max throughput. I imagine in an ideal streamed asset engine, all this high speed storage and fancy compression will be moot. We should be able to have a system with a minimum of RAM, VRAM, and throughput, and just use it all so much more efficiently. While daydreaming, chuck in a VR headset with foveated rendering and the perfect consle might be something like 4 GBs ultra fast RAM and an ultra low-latency storage solution at 2 GB/s. You could then either have a cheaper machine or move the budget on to processing.
Next-gen storage strikes me as a hardware solution to a software problem, as is often the way. And then the hardware leads, the software plays to its strengths, you get an entrenched paradigm. Once you get a point where the software paradigm can shift thanks to the hardware, the opportunity for something new has passed. If it's going to happen, it'll be a long, slow road. Still, it keeps the Tech websites in business making more and more benchmarks!