[Value of a BTC will always be related to the cost of power to produce it, since that's directly related to difficulty, which in turn is related to Bitcoin's popularity
Wrong because it is other way round. Difficulty is related to profitability of mining but BTC price is supply and demand on the market. BTC can rise or can drop and difficulty can adjust accordingly.
Nobody knows what the price of BTC will be. Anybody who claims otherwise is either a fool, tries to pump the value of his holdings, or both.