It's very important that we start creating new content again. We can only build on nostalgia so much before we have nothing left to build on.
"Joss Whedon Talks the Imperfections of THE AVENGERS, His Plans for THE AVENGERS: AGE OF ULTRON, and AGENTS OF S.H.I.E.L.D." by Adam Chitwood, collider.com. September 26, 2013.