Just using this year as an example (I have excluded games the 1.10 and 7.20 combo because that should have enough time to changeover, but even that is pushing it when you consider how clogged up the area can get for over an hour prior to and after the match). Ones marked with an asterisk start and finish within half an hour of eachother roughly.I would not imagine the AFL would schedule two games consecutively played. I can't remember the last time they even played two consecutive games at the MCG & Etihad. So using this precedent it would not be an issue at all.
Round 2 Saturday MCG 2.10, Etihad 7.25, Sunday, MCG 3.20, Etihad 4.40
Round 3 Saturday, MCG 1.45, Etihad 2.10
Round 4 Sunday, MCG 3.20, Etihad 4.40
Round 8 Sunday, Etihad 1.10, MCG 3.20
Round 9 Sunday MCG 1.10, Etihad 4.40*
Round 10 Saturday Etihad 4.35, MCG 7.25*, Sunday Etihad 1.10, MCG 3.20
Round 11, MCG 1.45, Etihad 2.10, Sunday MCG 1.10, Etihad 3.20
...you get the point. Heaps of conflicts and consecutive games. Some could be solved by fixturing the first game at 1.10 and the other being a night match but it pretty much rules out two Melbourne games on a Sunday and is very inflexible otherwise.
Having said that it's a much better idea than Eddies, but this flaw applies to both proposed stadiums.