Price manipulation may be going on, but the price of a bitcoin is still high compared to the cost of mining it. When the hashrate curve flattens out again (as it has before), or at least when the "cost of mining a bitcoin" flattens out near (but less than) a bitcoin, we will have a correct bitcoin price. This will happen either if the bitcoin price goes low enough or the hash rate goes high enough. Since the current hash rate is still going up, we don't have a low enough bitcoin price yet.