For SI.com, I wrote about what sorts of challenges Barcelona would face in running an expansion team in Miami. You've got to read the story to see how I feel but in general there are lots of question marks surrounding this deal.
If I had to make a bet, I'd say the bid goes through successfully because it's Barcelona behind it. There are lots of worthy bids out there backed by strong finances but Barcelona's got a brand name that is golden and MLS would be wise to continue their dealings with the Catalan giants. That doesn't mean it's the most deserving bid per se but Barca has power that you just can't deny.