Management strategies: How can we reverse the detrimental effects of 'hyperurbanisation'?

In Mumbai, a US trained architect Mukesh Mehta has proposed a £2 billion redevelopment programme for Dharavi slum which would entail the building of parks, gardens and new apartment blocks.

This rehousing project has faced major criticism.
-The envisioned apartments would be 14 storeys high and offer only 25m2 of space per family.
-There are concerns that the plans to only rehouse citizens who had settled pre-2000 will displace many families.
-The community spirit and informal sector would be threatened. There is little hope that the small pottery and textile workshops would be catered for.

Surely there are alternatives?
-There are proposals for local scale development
-For example the extension of existing buildings is a possibility: an extra floor with a 14ft window would ease overcrowding in households and reduces dependency on ventilation (reducing electricity needs)
-Surveys have suggested that small scale developments like improvements to drainage would be favoured
-Young Architects have proposed the idea of having 'spaceways in the sky' these are wide corridors connecting homes, replicating the streets. These would provide space for traditional crafts and maintain community spirit

-Many say the approach in Brazil is far more sustainable, with their site and service schemes provided in the favelas - there is provision of breeze blocks and materials for plumbing