In the year 2130 all of the Bitcoins will have been mined and the only reward at this point is transaction fees,if most people are using Bitcoin just as a store of wealth, then there are very few transactions, which means there is very little reward for mining and so a lot of computers would pull out of the Bitcoin network. Would this be a problem? If large Bitcoin transactions occured sparingly in 2130 and beyond, would the Bitcoin concept still work?
That's a long way to go and we are not there anymore to see what would be the scenario and the events that's going to happen after all Bitcoin are mined, but our next generation of holders and miners will have a fix for this, maybe in the future, future generation will have free electricity, because inventors and creators keeps inventing to the betterment of humanity, I'm sure electricity and power will be one of them.