How is iPad a counter-example? I have been using it since it came out: Retina display is awesome; the battery life is longer than my iPad 2's battery life; 3G support is super; iPad 3 works with no problems!

And did I mention that I don't have to use new charging cables? My family uses MacBook Pro, iPhone, iPod, iPad2, and iPad3 and I am happy I have to use the same cables for each.

I'll take iPad3 over iPad4 any day (at least for the next few years)