Soccer won't catch baseball anytime soon in the States. Canada may be a different matter but there's only one baseball team there anyway and it's close enough to Detroit and New York to probably stay relevant there for awhile.
As much as soccer has "grown", it's still barely a blip compared to baseball, basketball, and football. It's not even close to hockey, really.
Baseball has also enjoyed enormous growth in the past decade, BTW (insert HGH/steroid joke here).

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