Wind and Solar Energy - Way of the Future?

There sure is sun, wind, and water everywhere in the world - well, almost everywhere. So can other cities duplicate what Dardesheim, a small town in Germany, is doing for its energy consumption! Whatch this video and find out.

UPDATE (12/17/2008): Unfortunately the link to the CNN video library does not work any more. The video discussed the self-sufficiency of this German town as far as energy goes. You can read more about it here: Germany's renewable energy city.

Do you think this is the way of the future? If so, who will fund the large investments, especially in the current global financial crisis? Is this method sustainable? How long before wind and solar energy powers half the world's energy needs, or even 25% of it?