While Yeronga provides some good shade and a bank, I'd seriously doubt it could hold 5-6,000. I've been to a few finals out there and according to an article I just read, the 2012 grand final had a crowd of "almost 3,000". I was there that day and it was packed. I've also been to finals at a few of the other grounds and I doubt they'd hold many more.
The simple fact is that other than Burpengary (miles away from anything and zero shade) there's not a ground in South East Queensland that caters for a crowd of over 3,000 other than the gabba or metricon. We need one (ideally with our training base attached), and have for years. Hopefully this shambles on the weekend makes the AFL and the government realise that it's actually a need and they finally put their hand in their pockets.
Edit: there might be a couple of grounds down the coast that hold more than 3,000, but I don't know them very well.
The simple fact is that other than Burpengary (miles away from anything and zero shade) there's not a ground in South East Queensland that caters for a crowd of over 3,000 other than the gabba or metricon. We need one (ideally with our training base attached), and have for years. Hopefully this shambles on the weekend makes the AFL and the government realise that it's actually a need and they finally put their hand in their pockets.
Edit: there might be a couple of grounds down the coast that hold more than 3,000, but I don't know them very well.

