If we had the proper divisional setup, we would be playing Tampa Bay twice and Jacksonville twice every season. That would be advantageous right now.
Within no time at all the geographical tension and ability to attend the road games would overwhelm the historical value of the current rivalries.
Yup. I'm a big supporter of divisional realignment to reflect regional rivalries. It's the only viable long term solution to the NFL's attendance problem. It's no coincidence that the "best" division in terms of the rivalries -- the NFC North -- is also the one where the relative cities are closest together.