theres no reason why kaels world won't have its own great engineers and scientists and artists

not everyone is a warmonger.
Besides, you'd be taking out a huge chunk of the game, basically neutering peace based strats and cultural domination, making everything much more warlike.
Which is ok for some, but I prefer the diversity of approach that civ4 offers.
I hope that the adventurer system remains seperate from the great people system, and indeed put into the game as a 'rubber band' effect.
I mean, what could help out a dying civ more than a band of powerful units suddenly recruiting to help keep it from certain annihilation?