20 teams is probably too many. The soccer World Cup I believe only went from 16 to 24 in the early 90s, and then to 32 in maybe 2002? And that's in a format where literally every country except a handful competes in qualifiers. If the finals was more consolidated, I would say whatever, but because it's still regionalized up until the semi-finals, is there really any difference between being in the qualifiers and being in the actual tournament? Given the nature of baseball, I'd rather make qualification a bigger deal, and get it down to eight, and then go to a CWS format as the finals