Hello! It is no1drwhofan, here.
As I am sure あなた 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 あなた have read/skimmed through the above articles, I hope my concern for the show's ratings are もっと見る coherent to you. Nonetheless, I don't think anything または 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 次 time! Xxxxxx

Note: the ratings 与えられた in the captions of the pictures are not accounting for the クリスマス specials in the series; only the 13 episodes in each series. Of course the 表示する 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 クリスマス Invasion' (Tennant): 9.8 million.

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

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

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

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

2010 'A クリスマス Carol' (Smith): 12.11 million.

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