You know, if another theory cropped up, which slowly gained more and more evidence, more so than evolution, and explained the effects/evidence logically, everyone would change to that theory, no?

I think it's a little presumptuous to say that it does most definitely exist, when anything and everything in science isn't certain, by that I mean if an alternate theory disproved another more known theory with more evidence for it, then the alternate theory would become 'fact'.