Ideas are indeed worthless today. But to believe that completely is stupidity.

Internet, as of today, is a gold rush. Anyone worth his programming skill can work on an idea and get funded. But then, with the passing of time, all the low hanging fruits will be gone. Once we reach that point, good ideas will become scarce. Great ideas may not even emerge. VC funding will be gone too. Perhaps, in a decade or so.

Internet based companies are extremely easy to replace today. A chilling fact but true. Compare this with firms like Citibank, British Petroleum, etc. They have been here for decades and will be here. The same cannot be said for companies like Facebook and to a large extent Apple.