A lot will depend on the outcome of the ASADA enquiry. If that comes out well then expect a spike, if not then expect a lot of people will look elsewhere. Crowds return a lot faster than memberships. It takes a fair commitment for someone to sign up to 11 games. However on that note, many of these clubs with huge memberships actually have a lot of 'supporter memberships' in there with less value to them (as opposed to 11 game memberships with entitlements to finals and GF tickets etc)
Not next year, 60,000 is a 20% jump,in one year maybe in 2 or 3 if they continue to climb the ladder.