I spent some time browsing the Welk property list. Branson aside (and only because that place is loaded with timeshare options), any one of their properties is a pretty good fit with the HRC, I think.
There are three or four that I would trade to right now, just to go see them. So that's not bad pickin'.
I think if HRC was smart, they'd offer some sort of "get to know each other" trade system for Welk and Hyatt owners to access the new (for them) options. I don't really care how they go about it. Points, week for week, whatever. This would also show which properties are going to see added trade stress. I'm guessing Santa Fe, Baja and the Hawaii properties for Welk. And Carmel for Hyatt. (Welk looks like they skew West Coast, with a lop-sided portfolio which seems tailor-made for Californians.)