Breaking windows incentivizes the plentiful production of new windows. This will make it so that there is no such thing as window shortages in the future.
In a way, yes. If windows didn't break, that hurts profits of window-making companies, and makes them all go out of business, leaving people without jobs, etc. Once everyone has a Forever Window there will be no one to sell new windows to, and there's hardly much innovation left in the field of windows. Planned obsolescence is a thing.