It's certainly going to be interesting for Camden. If he goes to Hackensack, there's also the cost of tolls to consider: $16 roundtrip over the GWB. If he trained 6 days/wk, as many skaters do, that would be $384 mo/, roughly, for tolls alone.

Although, I imagine he might cut back to, say, 4 days/wk (??).
I would estimate the time for a Columbia --> Sky Rink commute as probably around 40-50 min total. The walk from the nearest subway stop to the rink is about 12-15 min. Factor in his walk from Columbia to subway, at around 5-10 min, plus 5-10 min waiting for the subway, plus maybe a 15-20 min ride on the subway. Sky Rink is in a neat location, but it's not what I would call convenient for day-to-day training.
I don't think driving to Sky Rink would make any sense, as parking is $26/2 hrs. Definitely cheaper to take the subway and probably not much more time spent overall. (It might even be the same amount of time depending on traffic.)
If I were him and going to Columbia, I'd look to see if I could take some of my classes during the summers. Another option might be living in New Jersey and only going into Manhattan a couple days a week for classes. (I have no idea if either of these is actually feasible with Columbia's rules.)
Camden's results at Worlds kind of put him in a new league in terms of his skating. I wouldn't be surprised if he were to reassess some of his plans in the next few months.