Let's be honest, if more than 15k are happy to sit at Eureka in the middle of winter, then I'll be surprised.Stage 3 will only see the stand extended around the Southern (Showgrounds) boundary and over the area currently occupied by the mound facing Creswick Road. That would allow around 14,000 seats. The architects Peddle Thorp have made provision in the Eastern Terrace to expand it if needed in the future. That will allow the stand to encircle 75% of the ground and give 16,000 seats That would be a Stage 4 perhaps. If they ever go to a stage 5 then that would involve considerable modification of the existing pavilion or building over the top of it to add more capacity.
I doubt that the venue will ever need to go to that capacity. I think that it eventually will be expanded to 16,000 and that, that will be just about right. The papers go on about the Tasmanian grounds holding 20,000 but each of those only seat 13,000 and have standing room only for the remaining 7,000. Eureka Stadium will eventually be an all seat and under cover stadium for its spectators.