The loop trail at the VCS is a good plan. A 1.2 mile connector to the Chaparral trail heads is not necessary unless it was part of a lager loop created by creating a trail heading east down the valley and on to connect to either the reservoir(which should have it's own loop), High Peaks trail, or Chalone Peak trail.
While I would like to keep the areas this trail would traverse and give access to distant, and preserve the solitude as it is, "National Park Status" has changed what was Pinnacles National Monument and there is no going back. There are too many visitors concentrated at the existing 2 major trail heads. To connect the West and East Sides of the now "Park" with a southern trail may be a smart option to distribute the visitor load with parking and access.
The effect and change on the West Side by establishing a southern trail would be significant, and could relieve a portion of the East Side day visitors if it becomes of a destination to balance the visitor influx( i.e. Bob Walton could exclusively hike in from the West Side).
JC, please do go to the public meeting on behalf of M&C. What are the long term camping and concession plans for the West Side?