Please be specific. I don't get what you mean at all, I already asked what is meant with infrastructure.
E.g. maybe you mean bonobo, in which case I think there is nothing using that. Maybe you mean gtk+2.0, in which case I do see progress (e.g. Firefox, Gimp), it is just taking some time. Maybe you mean gconf, in which I also see progress (often done at the same time as a gtk+3 switch).
All these GNOME 2 applications have worked and are working totally fine. Suggest to ignore claims of sabotage in this regard :P
Regarding porting work, various GNOME developers have performed porting work in more than just "core GNOME" stuff. Just take a look at a few of the GNOME goals.