Now I know there are loads of sample libraries devoted to this already (and I own loads of them). But when it comes to using, configuring and mixing them none have the Toontrack style.
So you have sampled rock, pop and dance drums to death? How about some orchestral/cinematic drums?
Orchestral Snares, Bass Drums, Cymbals, Taikos, Toms, Large Ensembles etc, you know the Hans Zimmer style stuff plus the traditional orchestral percussion.
I am sure you would have a captive market.
Make sure it has plenty of ambience in the Mic options, loads of dynamics and detail.