The theme I would want to see is a "Veterans VS Newbies" type, 6 teams of each? Also the veterans, hopefully, could come from early seasons too...
I really don't want an all-Couples season. They already have a dry run with it in Season 6, casting 7 couples in one season? And as diverse as the archetypes of all of them are, and as entertaining the bickering between couples are, those fights always gets tedious to watch and petty as the season wore on.
Besides, I don't think "Dating couples" is not the best name for it. Couples could be engaged, broken up, newlyweds, and married for a long time. Also peach, why did you put the married couples in the family bracket? They're still couples, such as Jonathan & Victoria who were married during the season. And even though married couples could still be parents, their dynamic is still much much closer to a couple's because of the romance.