Care to make an argument, or just an assertion?
Take supply and demand. What makes something worth the BTC / USD?
That you can trade it?
It's simple to say it's because people see it as valuable, or believe it's valuable, but such arguments are really thinly veiled tautologies.
The reason gold, bitcoin, silver are taking off is because there is a culture which has not only a valuation of these currencies but they have a rationale worked out that determines their value. Much like social stocks and microcredit. People are driven by the long term and abstract outcome as well as the short term concrete outcome.
Saying that gold has value because we think it has it, is an attempt to deny that others have thought together and worked out together the value it ought to have and what it means to them. It's an elitist attempt to discourage and divide the masses that are waking up together, regardless whether you agree or disagree with them on their opinions.
There is a culture behind gold and silver and bitcoin and it is only growing. And that's what's causing people to reject tweaks to the basic platform.