Why exactly would you wish the lot was never built? It's being used, which means there is demand for it that the local stations/bus feeder services AREN'T meeting as well, especially that people are willing to take the Turnpike (toll road) AND pay a high price for the lot to park in it, to avoid whatever other alternative they had (if any). The lot is full, there's a massive highway for access to it so no local traffic issues and there's plenty of space to expand it, get paving.
Most people don't really like making connections between commuter services (hence the 1-seat ride often talked about). NJ Transit schedules also don't have high frequency outside of the busiest hours, especially for a reverse-commute or other commute that isn't suburb - NYC/waterfront and back. The beauty of Secaucus, is frequency. You don't have to have a set schedule or know anything, you can show up, park, and a train to take you to NYP will be there shortly.
PATH is a pain to directly access for anyone not coming in on I-280, and exacerbates urban traffic problems, as you can only get to it (by car) by driving to downtown Newark, or the overloaded Skyway/Turnpike Extension, and then driving in downtown JC, which many people do every day.