Hello! It is no1drwhofan, here.
As I am sure Ты are aware. 'Doctor Who' has been running for almost 49 years. Furthermore, I think we can all agree that it is a very quintessential part of any Whovian's life, anywhere and everywhere.
However, there have been arising speculations over the last two years, resulting in my apprehension about the show's future increase with every passing hour.
Moreover, the below sources should hopefully engage your understanding of my worries about the show:

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Assuming Ты have read/skimmed through the above articles, I hope my concern for the show's ratings are еще coherent to you. Nonetheless, I don't think anything или anyone can articulate greatly I fear for the show's future.
But be that as it may, all I can do is enhance my optimism to the fullest possible degree, in the hope this will keep 'Doctor Who' running.

Until the Далее time! Xxxxxx

Note: the ratings дана in the captions of the pictures are not accounting for the Рождество specials in the series; only the 13 episodes in each series. Of course the Показать has high ratings at Christmas!!!! :)
Nonetheless, I will write them here instead, so we can see if there is a negative/positive correlation from 2005 to this very juncture:

2005 'The Рождество Invasion' (Tennant): 9.8 million.

2006 'The Runaway Bride' (Tennant): 9.4 million.

2007 'Voyage of the Damned' (Tennant): 13.31 million.

2008 'The Далее Doctor' (Tennant): 13.1 million.

2009/10 'The End of Time' (Tennant): 12.04 and 12.27 million.

2010 'A Рождество Carol' (Smith): 12.11 million.

Hmm...taking the above statistics into consideration, one may conclude that the Рождество ratings have gone down slightly. However, are higher than 2005/06. Nevertheless, Чтение the captions under each picture may suggest otherwise about the series in general.