Good piece, Bennie.
"There are prolific artists/writers/musicians who always seem to pump out new stuff," pretty much says it all. Your key word 'seem' can be illusional when you are the reader of someones works. We don't know the down times when any aritst is left without a road to travel. But all artists must reach those limits in order to grow, moving in new paths, listening to new stories, new songs, new directions... they all fuel the creative spirit to expand and achieve their full potential.
How many writers do you know, or singers/bands, that follow their path and then reach a limit where there works become stagnant.. rehashing old themes, old tune progressions. They either find new paths to express with the same tools or they change tools, or at worst they no longer continue the journey. Look at all the one hit wonders in any field of art. The journey took them elsewher to seek out their potential.
BTW: This post of yours is hardly a piece of shit, Bennie. I found it to be a worthwhile thing to read. Your ability is still sound, I think.