The Winklevoss brothers have a vested interest as they hold large stocks of Bitcoin, previously quoted to be 1% of Bitcoins, and have opened a fund around it, and so they would be expected to be bullish on Bitcoin. Success in their fund and personal net worth depends on them convincing others to invest in their dream. For them the sky is the limit, and a Bitcoin has potential to be worth $40,000 or more. It would be surprising if they did not have this attitude.
Now ask a a banker being asked by a miner to underwrite a proposal to build a datacentre of equipment containing new HashFast Sierras. The lender may appear to be prudent in using the current value of Bitcoins and then quartering it or quadrupling it, say from $400 to $100, or $400 to $1,600, over a year to examine the project probable outcomes.
The reality in the long term is somewhere in the middle, where the price of Bitcoins is given as:
PRICE = TRANSACTIONS VALUE + INVESTMENT VALUE
Examples of positive forces would be if Ebay or Amazon incorporated Bitcoin into their processing system, then the Transaction Value will be enormous. By further example of a positive influence would be if the Chinese were to hold more Bitcoins than ounces of Gold as a store of savings, then the Investment Value would be be massive.
Against this is are politicians running governments feeling a need to take a stance against Bitcoins due to the advantage it offers for hiding the identities of perpetrators of blackmail, such as Bitcoin payment extorted to recover your files on computer. There are also hackers waiting to take any means to steal other persons Bitcoins, such as the exploit on android phones they used to empty phone wallet.
No one can predict the future price of Bitcoins, however when listening to predictions try to discover the vested interest of the soothsayer. Is it a dodgy manager at Butterfly Labs wanting you to upgrade rather than cancel your 12 month old pre-order who talks of Bitcoin in the thousands, or is it someone posting on this forum how wonderful and profitable their equipment may become if Bitcoin soars as hidden to members they are actually selling their uneconomical equipment on Ebay.
i was going to say the same thing. i don't mean to be some conspiracy theorist, but if a guy owns large shares of gold and tells you to buy buy buy.. well, he's not doing out of the goodness in his heart. see glen beck:
http://www.buzzfeed.com/dorsey/glenn-beck-boston-bombing-is-a-reason-to-buy-goldor basically any other media financial adviser such as jim kramer:
http://www.youtube.com/watch?v=BpLfOF4zZW0