@jroper I understand your point of view... 
I'm in contact with Eugene Burmako the main developer of macros and he told me that quasiquotes should become the standard for writing macros in the future and that the current way of writing quasiquotes should be pretty stable.
The only risk is the compiling phase in scala 2.10.x with macro paradise. But this compiler plugin is only used to compile Play, not to run a Play app. Once macros quasiquotes are compiler, it's OK. So, would it really impact users of Play? Maybe discuss a bit with guys from Typesafe compiler services about it. 
I also think that writing macros as I wrote them 1 year ago with compiler AST is quite mad and isn't really maintainable. For many reasons, quasiquotes is the way to go soon or later.