You may be right, but you're looking at things through the lens of current rules of use for HRC, Vistana Flex, and Westin resorts. I'm looking at it through a more strategic viewpoint of what ILG wants to do to create synergy with all of these highly-leveraged new toys they own--namely, the HRC system and the Vistana/Starwood system. Having these systems operate independently as they have while under the management aegis of their respective hotel chains might be nice, but the returns are not very exciting when you've incurred very large debt burdens in order to finance the acquisitions of those systems. And in order to "juice" the returns on investment, I am guessing that ILG management is wanting to create a new "super-option" called HRP which will allow those members (not HRC or Vistana owners, unless they convert and agree to a so-called "upgrade") to gain access to all of the resorts that ILG now owns.
As I mentioned in a separate post, I'm guessing that the early test market of this concept is not going well--thus the delays in rolling this thing out. Ultimately, they're going to need the participation of existing owners, and those owners are not seeing the benefits, despite the best efforts of the sales weasels. The only alternative is to build new resorts for the HRP, but that is also both time-consuming and heavily capital intensive.
I'm guessing ILG is feeling the squeeze, and the synergies they were hoping to create when HRC and Starwood were acquired are not materializing.