Electron holes and current

[gomipile]

If all you care about is the frictionless planes and spherical cows that allow us to usefully predict how a circuit will behave in general, then yes.

However, if you're looking closely enough to measure momentum with sufficient precision to discern the momentum of the electrons in a wire, then no.

For instance, if you look at an electronic device that depends on producing and manipulating electron beams, the "hole" picture doesn't work so well. It works fine as a useful approximation within a wire, where there is plenty of positive charge balancing out the electrons. But in a vacuum with just electrons sailing through it, not so much.