Connector change (although in all honesty - long overdue, it was giant thing) is the biggest problem of this release. After so many of us accumulated car cradles, hifi systems, car docks, desktop chargers, alarm clock docks for all our Apple devices over the years, this simple change can actually break the order of things and fate of the iphone. Because new iphone doesn't offer much in terms of improvements (slightly bigger screen, another Siri that doesn't work in Europe for years), but takes away everything you had for your i-devices - takes away compatibility. And if compatibility with your existing "infrastructure" is to be lost, many might decide it's actually cheaper, easier and better to go android way - as in - if all this upgrade offers is bigger screen, better maps, improved voice control and different connector why not get one of the non Apple phones that actually offer bigger screen, better maps, improved voice control and most standardized connector on the market.
I think it was a bad move, it should have been done gradually, designed to be super easy to switch over - perhaps new connector should have been designed in such a way that Apple could offer free adaptor that didn't impair usability of existing docks, cradles and hard wired solutions etc. Something that third party "adaptor" manufacturers undoubtedly will fail miserably to do, as always, by creating some sort of wobbly, uggly, connector snapping hybrid, just adding insult to the injury.