Oh I absolutely agree! The old infrastructure that used to connect them all is still in place, well many of the old right of ways at least. One of them for instance is the Hudson-Essex Greenway which goes over to North Arlington and could feasibly connect right to the newark light rail from Jersey City, as could the HBLR to the ironbound. It is just a matter of political willpower to properly connect NJ to itself (like any good city!) by reinstating public transit within these places in order to move people around- and not just back and forth from NYC like these old lines used to.