I’m not sure how I feel about this casting. On one hand it’s nice to see an established actor have the roll. It might bring a darker, more mature Doctor than before. On the other hand, I think he might be a touch too old. But, like I did with Matt Smith, I’m going to give him a chance to grow into the role and see what happens.
I don’t think it’s fair for any of us to pan his ability to be The Doctor without seeing how he does first. He may surprise us with a very complex, and intriguing portrayal as Smith did.
It will be interesting to see how things turn out, but I’ll tell you one thing: I’m betting the regeneration is during the 50th anniversary special. Why? Because there’s something River said the Clara and The Doctor. To enter your own time stream is fatal, that the winds of the vortex would tear you apart. Ok, so where’s the Doctor? Inside his own time stream. How will he get out if it’s fatal? Sounds like a regeneration to me.
Always pay attention to the words spoken during a Moffatt episode. He writes from the back to the front, so a lot of them foreshadow the climatic episode.