Ropes course wouldn't affect the other stuff at all. Carnival Vista has ropes course, mini golf, suspended bike track, full basketball court, water slides, pool, splash area, adult only area (with hot tubs), giant screen TV and they still do amazing deck parties up there. It's easily doable on large ships.
I absolutely believe
DCL is going to add the latest and greatest physical things to the new ships. All the other cruise lines continue to add more and more including ice skating, laser tag, trampoline park and bumper cars (
RCCL), go karts and walking the plank (NCL), suspended bike track (CCL), magic carpet restaurant that travels up and down the side of the ship (Celebrity), zip lines, panoramic elevators on the side of the ship, and glass enclosure promenade deck with glass floor (MSC). DCL is going to have to blow cruisers away with technology and physical activities, my bet is they are going to be creating "theme parks at sea," and I can hardly wait!!!