Yes, OK, we get it... DITA isn't new. This is the same old diatribe we hear each time a new standard, methodology, technology, etc. is introduced to the field.
I will, however, take a shot at Palimpsest: I've never read a single claim that DITA can be used to "convert your legacy content or make the output from the Open Toolkit match your formatting requirements."
Strawman bitching comes off simply as bitching.