So, for Christopher Pike we have Bruce Greenwood. I didn't know his name, but I liked him in Thirteen Days. And even in The Core, despite the abominableness of that movie. So I can't say I dislike that bit of casting - even though he looks NOTHING like Jeffrey Hunter.
And to replace Jane Wyatt?
Well, she doesn't suck. She did really well in Little Women...a dozen years ago. And since then? She shoplifts.
Maybe this is her great comeback.