Don't kid yourself into thinking VZ is stuck here. There will always be people working the jobs - the only question is productivity which we all knows will trend up because new people gain skills quickly.
Heck, the company does not even have to call an impasse at this point. They already have exactly what they wanted - replacement workers - as many as they want - on short contracts for as long as they want.
All they have to do is replace EWAs with temps and scale back the hotel/travel/meal costs - which they are already doing.
There is NO scenario under which the company does not staff the call centers or roll the vans.