I always thought the information density advantage of ternary disappeared once you put it in the real world:

- harder to discriminate values as you pack more in the same dynamic range

- more susceptible to noise

- requires lower clock rates for (wired) transmission

- requires more complex protocols for (wireless) transmission

- representing 0 or 1 as switched states uses "no" power, but getting a switch to be "halfway on" uses a lot of power