Wouldn't the converse be true as well, with Vistana and MVC owners staying at Hyatt properties via Abound potentially being sold Hyatt ownership that can be converted to WoH points? Isn't this already happening both ways when those exchanges are made through II? In the end, Abound is meant to be an exchange company as described in its operating document which is worded to contemplate more timeshare companies being affiliated for exchange beyond Vistana.
After the whole Abound launch many-months-long speculation about the inclusion/exclusion of mandatory properties (you and I were convinced all the signs pointed to no) and what actually happened, I've given up guessing on what MVW might do in regards to ownerships and Abound. That said, two years ago a person I know inside MVC told me that despite the licensing issues and other factors that wouldn't allow Hyatt to be part of Abound at launch, MVW had assembled an internal taskforce whose sole goal was to find a way to work/negotiate with Hyatt to find a path to affiliation with Abound in some form. They said the primary target was the existing points program (HPC or HPP or whatever they call it now) as the weeks side was too complicated and ingrained with Hyatt brands. This was before Welk came along with its a-bit-crappier Platinum Points program integration into Hyatt Vacation Club, which might have provided a more distantly associated option for affiliation than the existing points program. I'm not going to hazard a guess if any of that came about or has any bearing on the speculation because I've given up as previously stated!