>>That's why,a lo of analysts fear of a possible crash in future just like what happened in tulips during seventeenth century which were sold in contracts.
Well here IMHO the most important thing is technical side of bitcoin ecosystem. If it will became more and more attractive to the simple users then bitcoin price will grow and stabilize at a very high value.
Simple logic. The currency must be more or less stable, but it can be stable only at a very high price.
I guess it is possible to calculate that price.
So the key thing is will bitcoin be used more and more as a currency.