There isn't much money to be made mining BTC now...the cost of doing so puts most people out of the game. Mining was never intended to be the source of value for BTC, it was just an incentive to get people to mine them. 10 years ago, you could have done very well. Now? Not really.
The whole point of limiting the supply was that the real value would occur *after* you couldn't make anymore due to scarcity. Between that and the amount of coins essentially burned due to things like lost keys would keep the supply low.
