Agree, unless you take all of the lounges at the monorail resorts and turn them into adult only. There's 2 in that area already..1 and a restaurant anyway. I think that if people are staying at those resorts with their child/children then they should be able to relax in a nice lounge, at their resort, past 8pm, on a night or 2 of their trip.
It plays a factor into my reservations, I (obviously) enjoy the lounge atmosphere while at WDW and specifically at whatever resort I'm staying at..mainly bc there are typically less children. These places aren't included on the dining plan, they don't have kids menus, and they tend to be a little higher priced.