You make a good point. However MLS in the summer and MLS as reaching equal footing is an opposite force. There are major problems if the MLS continues to play in the summer:
- Conflicts with FIFA dates. Forget about the world cup, in 2013 FIFA dates conflicted with 9 weekends on the MLS. No league can compete to be the best if the best players are leaving throughout the season for international duty.
- Major transfer peak time is in the Summer, if the MLS wants to compete financially they will want to buy and sell players during the summer because summer transfers command more money. It would not make sense to open the major trading season in the middle of a season.
Baseball is a dying animal and I agree MLS can take market share. Especially since MLB plays an exponential number of games compared to MLS. However, if MLS wants to compete against the rest of the world it cannot continue to play in the summer which means it will compete against NBA,NFL etc.
Personally, I can't compare the US to other world leagues. The MLS is different in almost every way. Salary caps, player ownership, youth system and team ownership is setup completely different from Europe. Major market sports in the US have the best players in the world playing in the best leagues in the US. I don't know if we can ever get to that point. However I do believe that the sport will grow and it will be successful but I can't see it as a major force in the USA. I hope i am wrong.