I just spoke with the flooring company. They are coming out next Friday to measure the living room and bedroom for new carpet. Yes, they will be replacing the carpet in both rooms. Which is quite a bit, as the living room is actually a living/dining room combination and includes part of the entry way.
I didn't think they could just replace the part that was off - too much time has passed. Then when I realized that the same problem was in the master bedroom (to a lesser degree) as well, I knew there were two options: replace all of it or replace none of it.
I'm thinking the actual install, with furniture moving, etc, is going to be a big pain in the rear, but, it will be nice not to have a stripe in the living room carpet.