Here is the thing. AAA baseball is nothing more than a farm system for MLB. People go to their games to go to a baseball game. They don't care about the actual success of the team because frankly the team doesn't care about the success. That isn't how soccer operates even as poorly as US soccer is set up. Professional soccer isn't going to follow the same path and equal out to the NBA or NFL. It will have it's niche market that likely focuses on smaller cities.
People are saying this is a bad thing because it won't be something they like or comparable to the 2 biggest sports in the country. That isn't the bar for success. The bar for success is will this improve the site it is going to be built on. Currently it is a giant pile of **** so the bar isn't exactly high.
I think this is the case for all minor league sports. Nobody is a die hard fan of a minor league team. The ability to sell tickets depends on the popularity of the sport in general in the market, the price of tickets, promos etc.
I honestly think the farm system things helps in a case like the I Cubs. Tons of Cubs fans in Des Moines, so there is a natural draw seeing rising prospects or rehabbing stars.