We would have to assume that a pregnant Frankenstein was the last of the feline cat species, othwewise it doesn't make sense that future descendants of Frankenstein were the only felines to evolve into humanoid. What about all the millions of felines on planet earth? Surely they would have evolved into humanoid form too, wouldn't they? Their history would be different, and thus they may still be around 3000,000 years later. They'd also have to have a different set of religious beliefs other than Cloister the Stupid.