i.e. projects those building goes through makrfile generation?
The problem here is: We cannot do a lot of things using Makefiles, they are just too limited. Take scripting in pre- and post-build steps for example. So a Makefile generation will always be only a sub-set of what's actually possible.
However, I see the chance for a more generic Makefile generator plugin (one exists already, but unsupported btw) to which other plugins (like a qt plugin) could contribute. I think that's the way to go... IMHO...