Taxibot systems are welcome additions to airports of sizeable magnitude, not smaller regional types. Anywhere where taxi times exceed 15 minutes could be considered favourably for the Taxibot
It's also worth considering that it's not just the
time spent taxying that determines the fuel burn, it's also the number of stops/starts during the taxy to the runway.
From the point of view of many airports, it's the resulting scope for reducing emissions by aircraft on the ground that's grabbing their attention.