Presumably you could set up "just charge fees" to have a grace period of 3-5 years to register your copyright (and pay any back fees) if you happen to want to enforce the copyright after that time.
It's also possible that you could set up a smaller fee for a news article, etc.
There are lots of implementation details that make "just charge fees" work.
Yes, exactly that model. In practice, you would treat that 4-year-old work as "under copyright" the same way everything written is under copyright today. This sort of thing gives you a chance to market your creative work with protection and avoid paying fees until you know that it is valuable. That would then allow the fees to be relatively high since only people with valuable IP would pay.
The alternative is that everyone's blog enters the public domain immediately upon writing unless they want to pay $XXX per article, which also seems wrong to me.
I think the first 5 years should be free; after that, fees apply, starting at probably $1000 for the next 5 years, and going up exponentially afterwards.
It's also possible that you could set up a smaller fee for a news article, etc.
There are lots of implementation details that make "just charge fees" work.