The problem with this theory is that it can't have contradictory evidence.
It's not that there isn't contradictory evidence to this theory, it's just that the bottom line is that there is no possible evidence that could ever exist that WOULD disprove this theory, for anyone who believes it. For the die hards, if they were personally flown into space and looked at a round earth outside their space-shuttle window, they would still be able to come up with a reason that the earth was flat. Maybe the window was secretly a tv, or the round earth was a picture taped up over the outside, or they were dreaming.