Another week, another bit of 'Doctor Who' speculation.

The Internet has been buzzing for a few days about remarks that 'Doctor Who' star Matt Smith made recently -- he appeared to indicate in an interview that he may only be doing one more season of 'Doctor Who' and then try his luck in Hollywood.

You'll note that the previous paragraph contained a lot of hedging -- that's because there's no confirmation from the BBC or Smith's handlers that the actor's next 'Doctor Who' season will be his last.

Still, if Smith leaves the role after next season, which is set to go into production in early 2012, I think it'd be a terrible mistake. Here's why.