Cheaper / smaller? I would say not likely. There is already an enormous amount of market pressure to make SRAM and DRAM smaller.

Device physics-wise, you could probably make SRAM faster by dropping the transistor threshold voltage. It would also make it harder / slower to write. The bigger downside is that it would have higher leakage power, but if it's a small portion of all the SRAM, it might be worth the tradeoff.

For DRAM, there isn't as much "device" involved because the storage element isn't transistor-based. You could probably make some design tradeoff in the sense amplifier to reduce read times by trading off write times, but I doubt it would make a significant change.