Yes, I agree, the future is bright. But it'll still take some work and a lot of money. Some people talk as if soccer's success is the US is as easy as putting on the games. It's an incredibly competitive market.
You can look at what other sports leagues in North America went through to become successful and see a lot of experimentation and changes before, as you say, they matured. It's hard to picture now, but the NFL was once the one with a shaky future (okay, maybe the AFL, but they were both very far behind baseball) and the NBA and NHL were both regional, practically minor leagues.