If you take away what NJT did to the 1 and 86, in terms of serving segments where the 4 did, I'm sure it would work. After all, the 4 goes to downtown JC while the 6 goes to Journal Square.
In terms of LSP, its asinine that the park has no direct bus service since the 11, 231, and 305 (to a very small extent) gotten the ax. I agree that the 6 should serve it more and help entice passengers to use the HBLR.