If Manziel is a hit then this isn't completely impossible lol, .01% chance - if he returns in 09 form and stays healthy for the next 5 years, possibly. The Browns have a elite defense and great line, if Gordon somehow returns next season with his head on and Manziel is a hit then this team could bring a Lombardi to Cleveland, and if Austin is a key part of that he could certainly propel himself into HOF discussion. He's still young.
In other words - in a perfect world maybe, but we don't live in a perfect world.