Originally Posted by
vitruvian
Except we get all kinds of stories where that's supposed to be the case, and even more, we get stories where the tampering in the past is shown as actually causing people and things in the present (or in the 2099 future, in the case of Tiberius Stone) to start disappearing or fading (although it doesn't really make any sense for anybody to experience that, since memories and perceptions should alter as 'fast' as facts on the ground, so if somebody was never born you won't miss them being there), in the case of Stone even while there was communication going on between the two times.
I suppose you could argue that it was all a matter of perspective rather than a single timeline actually changing, with the fading of Tiberius Stone actually being an indication that Miguel is being shifted to (communicating with) a different timeline, and I don't actually mind that idea much... it's actually very reminiscent of shadow walking in Roger Zelazny's Amber series, one of my favorites. However, I don't think anyone can deny that there have been quite a few stories set in the MU where it at least appeared to everybody, supergeniuses like Reed and seasoned time travelers like Kang and Immortus and Zarrko included, that the past had actually been changed.