RFK stadium (a baseball stadium) is the home to the MLS team that has the most stars on its jersey (DC United).
That stadium is older than I am. Be careful what you wish for.
Maybe a multi use stadium works well for soccer in Seattle, but it does not work well everywhere for soccer and MLS knows that.
The problem with DC United playing at RFK isn't because its multi-purpose, its that its dang near falling apart and DC United has to pay way too much rent to play there.
I don't think anyone has or should think an ownership group that doesn't include Zigy is gonna be able to put an MLS team in this new stadium.