I agree completely. The issue with baseball (and really every sport in the US) is the minor league teams are owned by major league clubs. Actually, Soccer would be a great place to start this here. There are several tiers of professional soccer in the US and they are all governed by the USSF.
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But that's is definitely the problem. Owners would never go for it.
Potentially the best place for it happen would be college....but even then....