Doctor Who (not Dr. ^o)) would still have the same number of series because each serial from each series continued on from the previous serial.
I agree with Michael though, in the UK the word season isn't used in regard to TV shows. Each TV series is divided up into series, some shows like Doctor Who have serials within the individual series, and sometimes, such as is the case of series 23, the series is in fact one big serial, which is then divided up into seperate serials. So episode 648 is an episode of a serial of a serial of a series of a series. Which can get quite confusing. But I digress, I think it would be nice if the option was available.
Also a question: for American shows it is compulsory to use American spelling, but is it compulsory to use British spelling for British shows, because if not, it really should be.