Ok first one (easy): Bitcoin and blockchain are relaying on miners, so the miners must be rewarded for the "job" and expenses. As far as know the mining at this stage is for some people with big machines, lot of resources, etc. what is going to happen with time and the reward is getting smaller and smaller? And when it reaches the limit of bitcoin creation? Are the fees going to be "too expensive"?
I know  are three questions but related to the same topic, more to come...