The reason copyright doesn't get fixed or removed is largely because the general public is worried more about other things and the big rightsholders continue their monthly payments—err, lobbying.
Though AI might change that. In the end, large corporations get what they want.
The general public also get sold on the rosy idea that copyright (and patents to a certain extent), protect the little guy, that thanks to this mechanism their work will not be stolen by opportunistic freeloaders. It also resonates with the "one day I will strike rich" mentality.
What they usually "forget" to tell you is that your IP is absolutely worthless if you don't have the resources to defend it in court, which in turns actually advantages freeloaders who either have relatively low costs to sue (patent trolls are basically an example of this) or enough money that they don't feel the pain if they lose.
The current system basically incentivizes suing over IP NOT creating it.