On our third B we decided not to have fixed carpeting anywhere. Carpet, we decided, was way too difficult to keep clean. We do have an entry mat and an inexpensive carpet runner in the aisle that can easily be cleaned or replaced as necessary. My wife will be more apt to change it just for appearance desires.
I'd consider if needing to replace a carpet to go to a hard flooring. We have recycled rubber which is fairly soft under foot. I did just learn of a cleaning trick for an all hard floor B. Open the back doors, stand in the front and blow out the dirt with a leaf blower. I haven't tried that yet.