The issue with not seeing any discipline for the referee contact/surrounding is that the "Independent" Review Panel that serves as the appeal board for suspensions is horribly biased toward the players and against the referees in MLS. It is, quite honestly, a joke. Referees are at the point in MLS where they've given up a lot of hope that the "I"RP will back them if a case goes in front of them.
I can state with a pretty solid degree of confidence that had referee Alex Chilowicz sent off 2-3 Orlando players for this conduct (as I would have done if conduct like this occurred in one of my amateur matches), the "I"RP would have overturned the suspensions.
As I said in the Inter-Real thread, this type of conduct needs to be a straight red. Full stop. I don't care what you call it, but it needs to be an automatic ejection. We have to get this type of behavior out of the game. It's an embarrassment, and it does nothing to show that referees are an important and respected part of any soccer match. Caution any second player joining in an argument (i.e. surrounding) as dissent. Send off any player making contact with an official in an argument/dispute type of situation. Do it now.