Have you seen pelicans in a zoo? They always have their small fields to show them around but their wings are cut back to loose the ability of flying. Would they have a little more feather, they could fly away.
What will happen to the people when not all of our feathers but some of them will be taken off and we will loose ability of something?
Maybe we have already lost it? What is the biggest change people have compared 300 years ago?
And what will we loose in 300.000 years? It is all up to us.