Yeah I'm pretty regularly checking bags domestic between 45 and 60 minutes so this would require a change in behavior.
Seems like UA has become so accustomed to squeezing its customers without a noticeable impact on revenue that they figure they can do this without repercussion, too.
These changes will also allow GAs to offload pax more easily and thus not have to hand out so much VDB comp. Win-win for UA, lose-lose for its customers.