Shake it up, Mr. Lyon. Shake it up
I wasn't expecting him, but I am perfectly fine with Peter Capaldi as the Twelfth Doctor. He's not a chameleon, except insofar as he's shockingly young in Local Hero (1983) if you noticed him first in Torchwood (2009), but he's an actor I watch out for. The Angel Islington, John Frobisher, Danny Oldsen, Angus Flint, Malcolm Tucker, Randall Brown; I'll be very curious to see what he does with this role. Especially if it means I get to see him and John Hurt in scenes together.

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I would also have liked to see more variance in the Doctor for the reasons you name, but I am glad that if they had to go with the more conservative choices, at least it meant an actor I really like. There were alternatives I would have found actively disappointing.
(Having seen Pacific Rim, however, I will say Idris Elba was a definite missed opportunity. I don't know if he was ever in the running from the show's perspective, but I saw a lot of fan support for him and now I understand why.)
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I read your comments on Capaldi above, and they give me reason to be interested. (I've seen him in too little before now to have an opinion one way or another.) Prior to reading that, however, my reaction could best be summed up as "eh."
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Enitirely understood.