They need success now so that they can get kids to follow them and play footy so that in 15 years those kids are at a draftable age and it can flow from there. They aren't going to produce local talent until that happens.
The AFL in planning this team never expected a huge fan base and locally grown stars in 5 years they always planned it too take 15-20 years.
Serious question, do you think success has anything to do with it?
I doubt it does anything more than for the short term (i.e. the coming season). If it is so fickle that they'll only ever have a fan base as long as they are at the top then what is the point? Do we just wait 30 years or 40 years? How many premierships do we have to feed them?