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How many people in Melbourne walk from Crown (or further away) to MCG??
That is 2.6km, I don't think you are giving the people of Perth enough credit, it will get used and in big numbers, you just watch.
Build it and they will come. Everyone bagged The Arena, it's great, everyone bagged Betty's Jetty, it's great (although not fully complete and there is that water park) but it is great and is being used.