It's a very easy fight to sell, they'd build the hype off Pickett beating Johnson previously. I'd love to see it, but the big difference is Johnson has grown enormously as a fighter and Pickett hasn't evolved as much.
Either way, it is an easy fight to market and it'll probably happen simply because Pickett is a decently known fighter and he would make the fight fan friendly and it'd be a great fight for the FW's.
If Johnson defends the belt a couple more times, I'd really like to see a super-fight between Johnson and TJ or Barao, whoever has the belt then. I think Johnson could beat TJ.