All this is rampant speculation. I'd say it's clearly not because iOS 6 Maps was met with such criticism: as others have pointed out, they've already fired Fors

All this is rampant speculation. I'd say it's clearly not because iOS 6 Maps was met with such criticism: as others have pointed out, they've already fired Forstall for that (and other issues). I'd say it was probably a combination of issues that led them to think that it wasn't a fit.