He's given an incredible boost to the show and helped make it what it is today. I'll definitely miss the mannerisms he's created in the character. But alas, he's right. It's time to move on to other projects and let someone else take the helm of the TARDIS. But man will it be difficult to fill his shoes!
Then again, I said the same thing when Christopher Eccleston left the show.
And here i thought they held off on the next series/season just so he WOULD come back to the part full time in 2010. He is a great Dr. and i will miss him, but Tom Baker still has the number 1 spot in my mind.
I had a very hard time seeing my childhood favorite Peter Davison decide it was his time to move on and regenerate in the '80s, now after three series (again!) David Tennant feels it is time to move on? It probably also comes from the bad memory of who replaced him (hated Colin Baker). What a missed opportunity that he won't be involved in Steven Moffat's first year.
I hope the five specials will get a separate release.
Actually we were just a few weeks behind them with the last season. So, no Tennant doesnt have a full season that we have not seen. All he has is the 4 or 5 specials that will air until 2010 when the next full season (13 episodes) will be made. The next episode (special) will be the Christmas one, on the BBC.
I dont know how those 5 episodes will arrive to us in the US, will the BBC hold on to them until 2010 with season 5, or will we have specials too? Dunno.