I found an article on Investopedia about how to measure Bitcoin's fair market value. I don't think this framework is statistically accurate, but theoretically plausible. Almost all predictions regarding Bitcoin price are speculative in nature, but backed by a solid belief that Bitcoin's scarcity and its underlying technology is potentially revolutionary which would have an impact on different sectors. Bitcoin has value because people think it has value, right. It means Bitcoins have positive expected value.
The total market value of a currency, its "monetary base", is driven by two things, transactional demand and reservation demand.
1. Transactional demand - Daily transaction volume.
2. Reservation demand - Hoarding/long-term investment.
It is expected that with more merchant adoption the transactional demand would increase.
3. Hurdle rate - Rate of return required to compensate for the risks associated with holding Bitcoin. Yeah, technopolitical hurdles or backlash from a country can have an impact on Bitcoin's expected value.
Theoretically, the fair-market value of one BTC should simply be the dividend of its predicted future monetary base (total market cap) and BTC in circulation, discounted by a "hurdle rate."
http://www.investopedia.com/articles/investing/050914/easy-way-measure-bitcoins-fair-market-value-doityourself-guide.asp?
Bitcoins does not have the fair value because those investors are earning a huge amount of profit from the market's volatility and because of that we can expect to become very wealthy if we are patient enough to wait until the price grow up before selling.