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...
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.
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.