Hunch: Is the ocean Florida's untapped energy source?

I read this article on CNN about Florida trying to tap the power of the Gulf Stream:

http://us.cnn.com/2009/TECH/07/27/ocean.turbines/index.html

For some reason or another, I have this odd feeling that the Gulf Stream would shutdown within the next 50 years. Must be the "Harbringer of Doom" within me talking...

Hopefully, the investors would have recouped their investments by then.