Sadly, I agree. It probably would be different if banks didn't decide to go chip and signature but now that they have, there's not really any sort of justification for most places to spend the additional money on the portable card terminals. For the few foreign cards that come in, they can just walk those cardholders to the staff station to enter the PIN (or possibly reject the card altogether and ask for another form of payment, but that's against Visa/MC rules).

Tourist areas might get those terminals though because that would be a lot of people to have to walk to the staff stations. The larger chains too, but they'd use those table side tablets to reduce staff costs more than anything else.