As already said, he is the main character, especially after the death of Shane, so he won't be going anywhere.
In terms of acting skills, Andrew Lincoln is not so good.
He tries to play an Alpha male but it's clear he isn't one in real life.
I just laugh when he tries to hard to speak in a deep voice. It reminds me a bit of Christian Bale when he plays Batman.
Shane, played by Jon Bernthal, was by far the best actor. The only reason we all hated him so much was because he played his part so well.
He had a natural leader feel about him, shame the writers made him the b*****d.
I wish they would have swapped roles.