Actually RCT2 is DEFINATELY needed.
RCT1 is showing its age. The graphics, while they still hold up, cannot be compared by some of today's games... yes... even the ones that do not require a 3D card.
The thing that RCT sequal needs, though, is the different brands of coaster-types. I mean, an Arrow hyper coaster (Magnum XL-200) looks completely different than a Intamin hyper (Superman: ROS, Millenium Force) ,which looks different than a B&M hyper (Apollo's Chariot).
They also need more diversity in the new track-types out. MF is just one example with very over-banked turns, a much faster lift (RCT still only takes you up at 5mph!!!), an elevated lift, and stuff in the near future that currently doesn't exist! (ie: looping hyper, corkscrew wooden).
It'd be nice to re-create the famous Cyclone from Crystal Beach, but with the limited track pieces... it's still not possible.
All I am saying is that the RCT sequal needs 4 things:
1) Official coaster manufactures.
2) Updated graphics with men, women, & children. Why is the entire park filled with guys?
3) Much better quie lines (those waiting lines). I never seen blue or red waiting lines at any park I visited... plus the stations should be a little more realistic.
4) Updated sound effects. The wooden coasters should be more distinct. The steel hypers should climb quietly. There should be more diverse environmental effects. What's there is good, but that was 2 years ago. Time for a severe update!