Funny question, for those who know, was Primeval Whirl's 900 p/h capacity accounting for both tracks? If so, that seems pretty easy to beat.
A quality high capacity attraction would easily match or exceed that, and probably TriceraTop Spin's 500ish too. To compare, Dinosaur is up around at 2400, most omnimovers would be over 2,000 per hour as well.
Of course, we'd love to see it do even better, which is where the third attraction comes in. Still, unless they have a solid offering to replace The Boneyard, that's still more people in line, hopefully they'll have some sort of playground somewhere or at least some exhibits.