Reminds me of how you can use google to track flu epidemics by looking at searches for flu medicine etc.
Intuitively I was thinking the same thing while reading - it must trail the price... and I'm assuming the people doing the searches are the people like me who are always a bit behind the active traders buying and selling at bottoms and tops! What kind of serious crypto mover is looking up Bitcoin on Google, they've got their trackers to hand already after all.
Having said that, there must be some kind of predictions we can make with this search data - just maybe more long-term rather than micro-time type predictions.