Didn’t know that, thanks. The one article I read did reference average crowd turnout . . . but those specialized MLS stadiums aren’t that big to begin with. I thought NHL stadiums are larger.
Given relative field size it would be hard for MLS to have lower capacity. Most hockey stadiums run in the 17,000 to 20,000 range, MLS seems to be running mostly in the low to mid 20,000s with a couple pushing 50,000. Not as big as I would expect for MLS, but definitely bigger. Of course then you have to fill, MLB has nice big stadiums that are empty most of the time.