I believe that change in the past would not effect the future. Just who it happens to. For instance, if Lincoln wasn't assassinated, someone else would've been. If Bush hadn't pushed us to war, someone else would have. If Bill Gates didn't make Microsoft, someone else would have come up with something similar enough with a different name. In reality, there is no change. There can never be any change. . .
Although, I would like to change the fact that my best friend died. . . =( *tear*