Re: Your replacements for Cole, JBL, and King?
A piece of coal, a hawk and a Burger King hat could do a better job.
No, but seriously, even though I despise the man and everything he does, I can't see anybody taking over play-by-play from Cole yet. Byron Saxton is doing well on NXT though, he'd be a great replacement personally, but I'm trying to be realistic here.
For colour commentary I'd go with Road Dogg. He's charismatic, an ex-worker who has worked in huge matches, and still young enough to connect with some of the target audience. I would go for Regal because he's fantastic, but I'm not totally convinced his voice would work in massive, action packed segments, like the Shield/Wyatts staredown for example.
So, in a perfect world: Saxton/Dogg