My bad I typed out a response but didnt post it by the looks of it. If its anything like the NBA, I doubt MLB is open to teams from any nation purely from a travel perspective, USA and Canada makes sense - opening the league up to Mexico, Japan, or Singapore would not make sense.
I understand the rationale that the best players from the world would eventually wanna play in the US, makes sense - but thats not really what the term World Series implies.
If they really wanted a World Series they should do what Europeans do and have a playoff tournament to crown a champion from different leagues in different countries. But then again the talent disparity between MLB and other leagues probs makes it pointless
anywho World Series is definitely a mischaracterisation lol