If thirty is "poor" how do you justify that statement?
I mean there were eleven dinosaurs in the 1993 film (only five of which you saw), there were ten dinosaurs in Lost World, fourteen species in J3 (two of which you didn't see) and sixteen in Jurassic World (of thirty four mentioned), so to my point of view, having thirty dinosaurs at launch this game puts the feature films to shame. Also, as I understand it you can "edit the DNA incorporating modern-day species" to create your own breeds of dinosaur, so that is thirty base-species with who knows how many variants.
I have no idea on what you've based your expectations, but it isn't any other dinosaur park game; Zoo Tycoon 2: Extinct Animals had fifteen dinosaurs, Operation Genesis, one of the best games in this genre had twenty five species of dinosaur in total. So if this game will be "a total let down" based on such a metric as quantity of dinosaurs, then no game will ever make you happy.
Agreed. 30 is more than enough to begin with. As long as the most important/known dinosaurs are in!