I actually like the Burke/Christina storyline. If Shonda fires him maybe she can recast him and eventually we'll get used to it. Or we could always root for Christina and a new character. Either way, I think his days are numbered. He'll probably be around until the end of the season and maybe she'll write him off as a shocking cliffhanger. If he does stick around then I'll assume the cast has gotten together (again) and talked about it (again) and all is forgiven (again).