Well, the way I see it is bitcoin has a limited supply, originally it was about 21 million btc were to be released into the block chain and this supply was supposed to last us 100 years before it was all mined, in about 6 years we already mined 13 million btc, so imagine what will happen in 20 more years, I know that with each halving the mining gets a little harder, but as time goes one people never stop developing more advanced technology and powerful machines in order to make it easier, I am not saying that with all the bitcoin mined the bitcoin will stop growing or increasing, but bitcoin and the block chain technology must develop as time goes on in order to adapt to the advancement of other technologies.