And till now every site so far has been inscribed!
Within the whole system, there is a steady stream to inscribe more and more sites. If a country wants its own sites to be inscribed (and they always find that they are worth it), they also have to look favourably upon the nominations of other countries. So the list will grow and grow.
On average, the quality will go down, but there might be some hidden gems among them.
We can start looking for this year's Tarnowskie Góry, but I don't think the 3 inscribed this afternoon are that bad.