The Hilton Club is different than HGVC. But I have heard of people exchanging into it using HGVC points.
BTW Hilton is building a new Manhatten HGVC from the ground up.
My understanding is that most of the new properties that are going to be built such as the new Manhatten project, the new Grand Wakikian at Hilton Hawaiian Village and the proposed Kings Land at Waikaloa are all going to require more ponts.
For now my 7000 points gets us all we need, but if in the future we will want to stay at the new high end clubs, it's going to be more than 7000 points for a weeks reservation.
While this may be a downside, the flip side is that we will still have lots of places that are very nice where we can get in for 7000 points. For example, in Honolulu I could stay at the Lagoon Tower or Kalia Tower for 7000 points and have all the same ammenities of the resort and the grounds. The minus will be I may not have the best views or the fanciest, most modern units, like the new Grand Wakikian will be. But hey, it's still Hawaii, and I still have access to the great beach in front of the resort!
I guess this in my mind is a plus of Hilton building all the new resorts (except the new Manhatten one) in the same locations, Orlando, Hawaii & Vegas. While we may not be able to get into the latest projects in the future, we won't be locked out of a location such as you are currently at St John Harborside. Now if Hilton does go to more locations in the future, that may be a problem, but currently it's not an issue.
Hope that helps a bit.
Rick