I'd say it would have more to do with not diluting the talent base any further.
I'd say talent dilution is a big factor, and that a few of the current expansion teams haven't had the best of times
- Geelong in their 3rd season won a single game
- Richmond was winless last season, but improved for 3 wins this season
- GC won 2 games & 1 draw last season, but winless this season
- WCE 1 win last season and 2 wins this season
- St Kilda 2 wins last season and 3 this season
North has been the best of the expansion teams,
Till its professional , I think Geelong will struggle. The draft system seems to dud us... but more teams would favour us. New clubs would not attack us would they.