IMHO people who never touched the Sailfish Alpha SDK shouldn't be complaining at all about technical issues/shortcomings/incompatibilities.
The others should wait for the new SDK with Wayland and Qt5 and will then realize how easy it is to port code from Qt4 to Qt5 usually.
And you'll probably not even realize that there's Wayland instead of X11, except for having better performance.

With PySide code the situation will look differently, but it was never advertised for Sailfish development in the first place. It's a dead Nokia project. It's opensource and you can try port it to Qt5 if it's worth, or wait and see what PyOtherSide will be capable of. Probably PyOtherSide will be the cleaner and faster approach to bring QML and Python together.