1. Rick Falkvinge - Founder of the Pirate Party announced that he was puttin all his savings into bitcoin in May 2011. At $10 a coin this was prescient. He also claims that Bitcon will be worth $2-5m. His thinking is that the banking industry is heavily regulated. A deregulated version of it has the potential to replace the total value of it. "I'm counting backwards. It is a transactional system and a store of value. What is the size of that market? How much can bitcoin take? It is going to replace international trade."
2. Tuur Demeester - Early Bitcoin investor and in 2012, predictor of central bank crackdowns on digital currencies. - In the above chart he shows off some of the markets that bitcoin could disrupt. If bitcoin can replace offshore deposits it could be worth $800k
3. Wences Cesaraes - Sold his compny Patagon for $750m in 1997. "There is a 20 percent chance it goes to Zero.....I think that there is a higher than 50% chance that bitcoin is goes to more than $1m."
4 Chandler Guo - Earlly angel investor in bitcoin. One of the biggest miners in China. In a few years when bitcoin becomes the basis of the world GDP like Guo envisions, bitcoin will most likely reach a market cap of trillions of dollars. This is not far off Rick Falkvinge's prediciton if you consider the total money in circulation is estimated to be $60 trillion. GWP as estimated by CIA is approximately $78 trillion as of 2014.
Who am I missing? The requirement for this list is some early contribution or track record in bitcoin or elsewhere.