I think it's our turn to go to Miami next season, so I doubt it'll matter, but Garber did comment on whether Messi would play on turf, like we have at Lumen.
“Whether or not he plays on turf is really going to be up to the player and up to Tata,” Garber said. “Now, there have been no commitments one way or the other to that. I think a lot of international stars come into Major League Soccer and they are either intrigued or concerned about not playing on grass. And then you see some of the best players who’ve ever played the game, the (Thierry) Henrys of the world and Kakas of the world, who played on turf. So I think that’s a process that will have to play out over time.”
And
“That’s going to be the decision of every club when they do travel to those stadiums that don’t have natural grass,” Garber said. “My expectations are that that’s what they will do, but there’s a lot of work that needs to be done to figure all of that out. MLS promotes a lot of international games and we have been able to bring natural grass into those stadiums, but we’ve never done that for a regular season game.”
Obviously, the best case scenario is a home MLS cup final win for the Sounders over Miami at home in the final this season.