I was recently reading up on vacuum tube like devices that could serve as a possible replacement for traditional CMOS technology. How could vacuum tube like technology replace CMOS if vacuum tubes don't have two different types of switching (In CMOS this would be N-channel and P-channel transistors). Vacuum tubes only stop current if there is a negative charge on the gate, in contrast MOSFETs have two different kinds of transistors (N and P channel) that switch with different voltages. So my question is: Is it possible to implement two different kinds of switching in vacuum tubes? And if not, why do people think this could serve as a possible replacement for traditional MOSFETs?
Here is the article I was reading: http://www.nytimes.com/2016/06/06/technology/smaller-chips-may-depend-on-technology-from-grandmas-radio.html?_r=0