Ballmer in 2007 also said the iPhone was not going to get any significant market share. It didn't even take close to fifty years, did it?

It did take a few years after 2007 before it became obvious to pretty much everyone that the iPhone was going to be a huge hit but took a little while before some oddities in the original software were corrected and people adjusted to not having a physical keyboard which some thought was going to be a dealbreaker out of the gate.