I don't like this argument. It's true that without copyright we would not have the current status quo, that much is obvious. But what we could have instead if everyone was allowed to remix any content and create things freely based on other published works is unknown and unknowable.
It is not obvious to me than having copyright is better than not having it. It would be better for some people and worse for others.
Agreed, I do think we need to make sure creation is rewarded, but creation should also be used for the good of society not hoarded for wealth. That's the problem we need to solve, we need to look for systems that encourage creation WITHOUT the need to create artificial scarcity and means for people to collect rents on intellectual property.
To wit, intellectual property itself is likely a concept that keeps us locked in a local maximum.
It is not obvious to me than having copyright is better than not having it. It would be better for some people and worse for others.