There are plenty of ideas around. Even this thread has a few. But you could also hop over here viewtopic.php?f=76&t=41879. There were a number of threads that basically discussed the same ideas over and over again. I dont really want to do it again.
What is lacking, in my opinion, are complete concepts. Take this thread for example. The opening post sets out with declaring that AM/SHA are too strong damage dealers and then proceeds to propose a number of changes to heal abilities. How does that fit together? What is the goal? What are these changes supposed to accomplish?
I would much rather discuss something along the lines of: I want to see SHA/AM as go to healer in 6on6/city/RvR/whatever fights. Currently they are subpar because of X, Y & Z compared to G, H, F. Therefore I propose the changes A, B & C etc. Maybe a few of the more experienced players could get together and write something like this. Than again, who knows if the power that be are even interested in something like that.