(click photo to enlarge)
Key: Blue = Uninterrupted Premier League tenure; Red = In lower division; Grey = season yet to be played; Green = team in Premier League after relegation (and probable lineup changes).
The above chart maps the fortunes of all the teams promoted tot he English Premier League since 2001. It shows the startling decrease over the past four years of promoted teams strengthening over time.
Full analysis coming Friday. As this is as artistic as I get, thought it was worth sharing early.