http://detroitography.files.wordpress.com/2013/09/detroit_po...
They've lost an additional 250k people since the year 2000 as well, so just add to the misery.
Just to add to the complications: they'd almost have to–due to either social pressure or environmental pressure–demolish the streets/poles/etc as well, else they still pose a maintenance requirement and an eyesore.
Also, Detroit has plenty of wealth. It just all sits in the suburbs. The article even shows a mansion in Grosse Pointe and another with 23,000 square feet in West Bloomfield. These people are definitely executives at businesses in the Detroit area.
Also, it is worth noting that the suburbs surrounding detroit include some of the wealthiest in the country. There is certainly an investor base
[1]http://en.wikipedia.org/wiki/Dan_Gilbert_%28businessman%29#D...