While its true HTC listened, and listened wisely to their vocal customer base, Motorola is playing the "if the carrier allows it" game. Motorola can simply come out and say we will ship phones with unlocked bootloaders period. HTC says it,*SonyEricson says it, LG and Samsung don't seem to be too worried or locking things down. Its really just Moto now.
Also as we have recently heard if you brick your phone and they find out you bricked it due to rooting Verizon can and will likely charge you retail for the replacement phone. This is a policy I can both agree and disagree with. First I can agree from a simple position that rooting is being done by many who have no clue what they are doing, and do not take the time to READ, READ, READ and expect their total fubar moments to be covered.
Now that said IF rooting had nothing to do with say a display going bad, a mic failing etc, it should not be an issue. I root, I learn, read prepare and above all else take responsibility for what I do. Phones are not cheap yet they shouldn't be so locked down, loaded with crapware and made to be unbearable. I actually wish we had a full GSM (or LTE in the future) network so we could just take any phone to any carrier. Alas that will NEVER happen.