Yes this can happen BUT I had the ThunderBolt and also the OG Droid before that and there were a ton of custom kernels floating around for each device. I followed all the forums I could find for both phones. I would say the number of people that post about returning their Razr for insurance or warranty due to likely their own doing is easily 100 times what I saw over the years on other phones. In fact I am hard pressed to remember even one ThunderBolt user returning their bricked phone. If Moto is doing this to save money then I gotta say they are doing it wrong.
I picked up a Thunderbolt in June 11 to lock down unlimited data... . You had to have a working knowledge of basic adb commands, the right drivers installed, there were (and are) always precautions to take when flashing kernels or radios etc.. It was a lot of work compared to what needs to be done now. Don't get me wrong, Its great having Matt cranking out these automated bat file packages, MUCH better than having to adb shell it all, but at the same rate as things have become easier, the overall capability of the user has declined significantly. If someone can't restore the phone to factory settings with Matt's util 1.7/1.8 etc, how is he/she going to fare when it comes to mix/matching CDMA/LTE radios?
From my experience, its always the stupid ones that get the angriest, never donate to devs, and feel put upon if getting what they want takes more effort or intellect than face pounding the keyboard.
They don't read instructions, get mad when they F$ck their phones up, blame the devs, blame others, flame people in threads and go back to the store and try and get their money back or warranty claim a phone. I worked for a smaller regional cell company for about 6 months last year as a tech and towards the end I seriously wanted to choke someone. That's why you won't see unlocked phones....the dev community is too nice, and most people are too stupid/lazy to put forth the effort to know what's actually being done when you hit 1, 2 or 3, and VZW doesn't need to create unnecessary work for themselves.
If VZW starts selling unlocked phones, you can bet its going to be at full retail If not, the current leaked version of ICS (.215) is very polished, heck even the original ICS leak was worlds better than the garbage that was on the Thunderbolt out of the box.