The abundance of Canadian-born and raised TV news anchor people suggests that central/western Canadian pronunciation is accepted and understood as being the standard of clarity. Peter Jennings was a CBC pronouncer on ABC. Morley Safer (CBS), and John Roberts (CNN) are prominent examples. Frontline news reporters are also abundantly Canadian. And then there's
Shrek, the most famous hidden Canadian of all (okay, maybe Mike Myers is a close second and Jim Carrey and Shania Twain). And everyone thinks that Celine Dion is an American with a normal accent.