What year is the truck?

They don't just "fall apart", unless your truck is so old they are all falling apart, or you managed to get some corrosive substance onto the sensor.

Odds are they damaged the sensor when changing the tire, it's pretty easy to do if the tire guy is new.  

I've talked to far too many people asking what the "Horseshoe with Exclamation point" light on their dash means, even when looking at the car you can tell a tire is half flat.  Most people don't care which warning lights on the dashboard are lit as long as "The car still drives", no matter the amount of noise made.  

What seems like a majority of people just keep driving it until something breaks so bad that the car doesn't go any more.   They then get very pissed that the repair bill is 2 grand because of the cascaded failures they ignored since the car would still run and drive, just with a bunch of warning lights on the dash.

I don't think the government should have mandated TPMS, since that forced some very hinky implementations of it, but if manufacturers had put true gauge pressure monitors on all tires (the right way), and people pay attention, it would save a lot of wear and tear on cars, tires, and breakdowns from a tire finally going all the way flat.   The extra mileage thing is just a bonus.