most people do not have any idea about "fair value". I would bet on seeing tons of weak hands selling too early and (maybe even buying back afterwards) If Sir Isac Newton did during south sea bubble why would not average Joe? Usually people get too late to the party. I guess another way to confirm the current value of network would be see historical data of nr. of transactions vs btc price. To answer your question to calculate ATH would be e powered by 1.87 times X todays expected price