I love it. It takes nothing away from the accomplishment of getting there "for real". Think of it as a mini-game option, or just forget it exists all together if you do not like it. Also keep in mind it will play and score very differently if you earn your way there vs playing it separately. Earning your way there will take into account the path you took to get there, amount of dinosaurs captured, workers rescued, etc in what you need to do. That will be randomized in the mini-game. (If I understood the description correctly that is...)
The leaderboards will be completely separate too, so no worries about "diluting" the accomplishment. Not to mention, this is one of those wizard modes that will be seen very rarely, if ever, by the vast majority of players. It will be awesome for my daughter and wife (and heck, me) to be able to experience it for a change of pace whenever we want to.
And the fact you can play it either for score or speed runs is genius. This will definitely end up being a super popular side-tournament / dollar game mode.