Cinematic Subsidies

I get the feeling that without state-financed films (read: British film industry) and, more importantly, any ole' historical film or show (most recently, Rome) requiring a faux-foreign accent, British actors would be out of work or defecting to the States in droves. This is in no way an original observation, but what up wit da all-purpose English accent, yo? And if American twang is considered ever so crude for mass consumption, be we playing Romans, Egyptians, or Armenians, will there ever come a time that levee's gonna break? Kudos to Mel Gibson for his earnest stabs at lingustic authenticity--whatever their enabler's subtext!