telsor
Hall of Famer
It's generally cracked 50k+ the last couple of years, it's a replacement game for Melbourne members and even with the Essendon fall it's still their first game in Melbourne for the year.
and Essendon has been promoting it for a while now with the history/unity stuff (and unofficially it's been building as a F U over the whole drugs saga). That'll probably get a few more in. 60 might be pushing it, but I'd say 50 should be very doable (assuming decent weather).
I really doubt Coll v Rich would draw 80 as well...Both teams efforts last round wouldn't have inspired fans to make an effort to get in, and anything over 70-75K always requires things to be going pretty well, especially with the need to get enough neutrals to fill the MCC/AFL reserves.