vacuum transistor

Moore's law has commanded MOSFET transistor channel length down to 16nm and max. speed up to 40GHz. Physics, especially the tunneling effect, must start to rein in further significant advancement (Well, I'm thinking inside the box). Now, a promising(?) research on vacuum transistor (similar to the old bulky vacuum tube) may push the speed 100X faster or more. Since the extremely short channel length is much less than the mean free path of air particle, exactly what vacuum transistors require, these still-experimental transistors may push computing technology to another unimaginable milestone.  vacuum transistor