bad idea?

Given a small, globally routable netblock to be used for front-end web servers, and a strong aversion for using DNS for any type of load balancing, would it be reasonable to build two identical servers farms with the same public IP addresses and rely on the BGP sessions with the hosing providers to remove one advertisement in the event of a problem? I've been looking at ways to ensure that the webservers are always available, short of building a network connecting hosting facilities. Jeremiah being a customer stinks