Look at it this way Muzikool, if people had said that a few hundred years ago, Columbus would never have discovered America, you would never have existed and we all would be convinced that if we left the shore and headed east we would fall off the planet.
I can understand the urge to make that comparison, but I really don't think that the argument holds much weight. I suppose that there is a logical sequence in the exploration from the Earth to the moon and then to the next closest planet, but I don't feel that the exploration of Mars is nearly as important as the exploration of the planet that we inhabit.
I'm interested in the Rover mission and what can be learned from its findings, but as far as human exploration on the planet, I'm not convinced that it is significant enough considering the cost. As of yet, it is too soon to say that any human exploration on Mars is worthwhile, which of course holds true to the contrary. But if plans are being made for this to happen in the next several decades, then that makes me wonder what the ultimate goal is. I can't help but think that the space program just wants its next great achievement, and is that really worth all of the money that could go towards more worthwhile things?