Midland infill - what happens now?

I recently wrote a blog about the role of infill development in the established parts of Australian cities.  The example of Laverton, in Melbourne's western suburbs was used.  It showed that despite the incremental nature of infill development, it plays an important role in adding to the dwelling stock.  However the supply of land available for infill is constrained, both by the individual decisions of home owners and the planning scheme.  What happens when a suburb has been infilled?  This blog will consider the example of Midland, an established suburb in Perth's north east.