I actually think such vacuum transistors are the future of digital electronics. I remember first seeing the research on them when I was in grad school back in ~

I actually think such vacuum transistors are the future of digital electronics. I remember first seeing the research on them when I was in grad school back in ~2014 or ~2015. The big challenges I see are making a complementary version, to get CMOS-like power savings, and mass producing them with sufficient yield. If you can do both of those, it should be possible to 3D stack them, which would put silicon transistors to shame.