Why? Promotion/relegation can be nice by making a few games at the end of the season more exciting and allowing a city like Des Moines to get an MLS team. It can also solidify a few teams at the top, destroy rivalries, and could kill the league.MLS needs to become a promotion/relegation league in order to be watchable, imo
The mls has had something like 15 different champions since 2000 (I’ll try to find the actual stats when I get home). You wouldn’t get that with pro/rel and don’t get that in other leagues