Hope it works out better for him than it did Tennant.
What do you mean? Are you referring to post-Doctor Who success? If so, Tennant has been extremely successful. He's been starring in an intensely popular production of Much Ado About Nothing in the West End - a fantastic production, by the way.
More post-Doctor Who american success, which Tennant has not ended up with an overabundance of so far. One can only wonder why, seeing his performance in the pilot of Rex Is Not Your Accent.
I think it only sounds wrong to us because we're used to hearing his English and Scottish accents.