But surely the whole point of that glut of content is that you don't need his image, not that you should be able to take it without his permission?
As you say, there are thousands of sunset images, probably thousands under, say, a CC or free license. That means you can use them, not that you can declare his image is worthless and use it.
In terms of can copy therefore, should be allowed to copy, that just changes the potential nature of the contract that exists. With physical goods there was a barrier to copying, but there are plenty of situations in society where what governs our behaviour isn't what we can do, it's what we all (or a vast majority of us) have agreed to do because we believe that is in our mutual best interest.
The fact it's easy to copy things means the potential for change exists and the mechanisms whereby restrictions are enforced may change, but it doesn't mean that in the future can copy will automatically mean is permitted to copy by society.
Yes, you can't stop progress, but the direction of progress is still unclear.