[DubiousPusher]

For various reasons, ISPs tend not to build competing infrastructure. Many municipalities grant time limited monopolies to Telecoms to get them to accelerate infrastructure construction. Also, after an ISP lays its lines and pays for them, it can make all future pricing decisions on the margin, meaning, it can price its service just above the cost of maintaining it. Another company will find it very difficult to incur the cost of construction and keep its price competitive.

I don't know enough about unbundling to say if I support it or not but I believe it has been pretty popular in countries that have adopted it.