The very idea of this would be met with pitchforks and torches and the angry Club WorldMark mob shouting, "Wyndham does not own WorldMark!"
So, no, WorldMark is different enough (and better?) from Wyndham/Club Wyndham that it would deserves its own Destinations forum status, just like Club Wyndham would.
I think having them as separate "Timeshare Resorts Systems" (as it is now) is better than trying to synthetically "unite" them under a "Wyndham Destinations" umbrella, which would serve what purpose?