Bitcoin : Are we taking it ahead or is it taking us ahead ?

After hearing about the craze of bitcoin in India , I went through its history and when I figured out it has made many millionaires in few years, I could not resist thinking what makes it so valuable ?

With any physical currency associated is an economy. What economy drives Bitcoin up and down ? Is it just the supply and demand and all the hypes ? What happens if someone will sell 10000 bitcoins ? Price will go down ? 23% of bitcoins are never used and nobody knows when they could be used.

Block chain as a technology is certainly an evolution. There can be several good use cases of using these technology. But is Bitcoin a realization of it ? Because we are wasting so much of Mother Nature's resources to compete (Mine, which wastes lot of electricity which ultimately gets generated out of some natural resource) to gain these Bitcoins ?

At the end we all ( irrespective of country, caste or religion) are children of this one Mother called Nature. Have we all as a human society, ever been able to stop the Mother when it takes its own call ?

Not sure if Satoshi had the vision of this and disappeared because of that. If he had such a great mind to create block chain may be he/she also could foresee where its heading.