More people will try to use bitcoin and the fees will increase anytime as soon as possible.
The fees of bitcoin depend on the traffic of the bitcoin network.
As simple as that. These days there is some saturation, more transactions requests from which they can be processed. This causes the fees to be higher to gain priority, if the number of transactions were lower the fees would be lower as a consequence. You can also choose to pay a little less fees if you have no problem waiting longer to complete the transaction. It´s true that the biggest problem is for micropayments, one dollar payments or the like. In the future solutions like Lightning Network will surely impose to solve this.