I think premiership windows are very relevant. Although we'd like to go into a season thinking every clubs a chance at a flag, realistically, they are not. Clubs also can't maintain a very high standard of footy forever. We see all successful clubs rise and fall, though some admittedly fall further than others. Hawthorn, Collingwood, West Coast, Sydney for example are in a position to challenge for a flag next year. Gold Coast, GWS, Melbourne and the Bulldogs for example, are not. We might not ever be able to predict the exact winner, but I'd bet my house at the start of the year I could pick the flag winner if given say 6 choices. Those would be teams in the premiership window.