strike or not, there is no way the rest of the shipping industry can quickly handle all our volume. small package shipping would grind to a halt the first day we walk and there's no more pickups. every company in America is on the phone to fedex or usps to schedule a pickup up at the same time or within a week or so if they get notice. lol no way is that gonna work. we would kill small internet sales companies and do considerable damage to the larger ones. we talk of how much money ups would lose but think of the collateral damage the ripple effect would cause as well.
another point about scabbing. same principle holds here. the day we walk the pickups stop. the deliveries will continue by sups and whoever might not walk (god help them) for a short while until the system is cleared out and then that's it. doors are locked. after a week or so you wanna cross and go back to work? to do what? we go back to work the day after the strike ends to empty buildings and empty trucks and start doing pickups. the amount of time it would take to get the operation back to the point where there is enough work for everybody is anybody's guess.