Not sure it's just the relatively last-minute ticketing aspect (although think it has a lot to do with it, partucularly for reserved seat holders being shoved every which way for seats each week + not being able to just "rock up" in GA if you feel like it on the day).
Lots of people traditionally would have made plans in advance around the fixture at the start of the year. Personally if a mate asks me over for dinner 1 month in advance, and i don't yet know which day the footy is going to be on, I will agree. With the AFL's new "rolling fixture" release, there are inevitably going to be clashes with other events that have been committed to, where in previous years you could just say "can't friday, how about saturday instead?"