Changes will happen depending upon the increase in the adoption rate as well as based on the increasing demand. As per my understanding the mining difficulty will increase and the network congestion will happen if there happens sudden drop in the price. Apart from this, when there is congestion automatically the fee will increase.
Moreover, the narrower mining network will greatly increase the cost of sending funds, making it unstable in the market. the miners will put more pressure on investors to increase the liquidity price of bitcoin. As a result, the problem becomes more and more difficult and will not end.