In my opinion, until there's another large event that brings a ton of new blood into BTC, we're going to see long-term sub-100. No volume is simply not a bullish market, so if the price stays high amidst no volume it's always because of whales making large moves, but whales can't sustain a market by themselves in the long term.
Our market is controlled completely by the whales. Left to it's own devices, we see slow increases. We move when the whales sell or buy, and lately, they have sold more than bought. This whole downturn was initiated by a single sell of 25k. BTC volume is on par with a year ago, when we were seeing slow steady increases. Dollar volume is obviously much higher. We could see sub $100 for quite a while, but it will be because the whales keep increasing supply. Everyone is being played by the whales, it is comical to watch. They know their time is limited, so they just keep pushing down the price to acquire more while they can.