My take on this is its a quick fix whilst the bigger plans for the stadium and surrounding areas take shape. At the end of the day 3 months to knock something up from scratch isnt that long, they sort of rushed the planning through and obviously went for something small as a tester to see how it works.
Honestly I think this is a temporary structure for a season or 2 max, the chances are the stadium is going up to 60,000 at least we are getting a world class training complex on site, plus presumably a raft of shops, bars, restaurants. There will be hotel space, convention space other forms of entertainment (water park amongst other things has been mooted). Probably a residential aspect. As they say build it and they will come, the area might be a bit of a shit hole now but then so is old trafford / salford and look at Salford Keys, Trafford centre etc.
There is so much space and land around the stadium thats been doing nothing for 50 years the whole area is ex colliery, gas works and heavy engineering, there is well over 200 acres available in addition to the huge mount of land the owners have purchased already in the surrounding areas (its been estimated they own an area already twice the size of sports city) + sports city itself which is hardly over developed itself is it ?
All within ten minutes walk of the city centre. From the ideas that have been floated already this is a huge project, certainly one of the biggest privately funded leisure / entertainment developements in the UK ever by an individual - £1 billion without upgrades to the stadium capacity thats the same sort of money they spent redeveloping the Greenwich Penisula and the Millenium dome in London. Its likely to take many years to be completed so we are going to have to be patient.
If this comes off the whole of Manchester not just city fans are very very lucky. This really is a once in a lifetime opportunity for the city. It could well create thousands of jobs in one of the most deprived areas of manchester.