I kinda agree with anytimepally that Elijah Wood would be too old for Robin now, but if he were younger, he'd be great!
Here are my personal "real Muppet casting" picks:
take them as you will...
Kermit - David Duchovny (or Ewan McGregor)
Piggy – Kirsty Alley
Gonzo - Adrien Brody
Fozzie - Eric Stonestreet
Animal- Dave Grohl
Dr. Teeth - Elton John
Zoot - Slash
Floyd - Tom Petty
Janice – Gwen Stefani
Pepe - Cheech Marin
Scooter - Andrew Garfield (or Justin Long)
Rowlf - Zach Galifinakis
Rizzo - Steve Buscemi
Robin - Elijah Wood
Statler- Steve Martin
Waldorf – Billy Crystal
Sam – Kelsey Grammer
Bunsen- Martin Short
Beaker- Paul Reubens
Sweetums- John Goodman
Walter – Ryan Dosier
I love the ideas of Steve Martin and Billy Crystal as Statler and Waldorf, Martin Short and Paul Reubuns as Bunsen and Beaker and Kesley Grammer as Sam. I think in one Empire issue, Eric Stonestreet said he relates to Fozzie. I don't know, I may be thinking of another actor...
Adrian Brody as Gonzo?! C'mon! You're just saying that because they have the same nose!
Pardon me for being ignorant, but what does everyone have against Steve Buscemi as Pepe? I honestly don't know who he is, so please enlighten me on how he would be the wrong choice.