X no way out and black hole are old news bro, you gotta think ahead.
John Wardley said at that last TT convention, you need a HUGE building to fit a meaningful sized coaster. He also said that a Wildmouse in the dark is very fun ride. Your coaster either has to be bunched up or just small/short. That said the black hole never raised any complaints.
WHAT I think might be the way forward, is something like Saw Th13teen and probably SW7 where you have indoor sections - but with more emphasis on the indoor bit. I would like to see a relatively bigger indoor section that is essentially good quality dark ride - so lots of effects and themeing and moving parts.