I doubt that you could force all such traffic to be so routed, given that there are coast-to-coast transit networks that would not be affected by a BGP hijack (

I doubt that you could force all such traffic to be so routed, given that there are coast-to-coast transit networks that would not be affected by a BGP hijack (IGP routes are often preferred to EGP routes). In all likelihood the situation would not last very long as network operators would quickly respond to the anomalous traffic pattern and deploy various route filters to correct the problem.