Now ~16 million BTC were mined. Therefore ~5 million BTC is remained to dig. I think that those bitcoins won't be loose as the early mined bitcoins, so ~5,000,000 BTC will come to the crypto exchange markets in many years. But this process will be slow, and the price of Bitcoin will be stable. But actually, the price of any coin mainly depends on the current invest climat in the field of cryptocurrencies.