Parsippany gets bad traffic every weekday. I-80 can get backed up and I-287 is mess from Morristown north to the 80 intersection because you have routes 24, 10, and 46 also converging there.
Plus, a huge portion of the fan base is in Monmouth County and those folks would never make it up on a weekday. The traffic on 287 down in Middlesex and Somerset counties is horribly bad, worse than what I just described above, and that would be their most direct path there.
And as mentioned above, there would be no mass transit to help people avoid driving.