Comment by inglor_cz

"We have so much space".

No, you don't have that much space. The entire Switzerland is half the size of Czechia and half of it is taken up by high mountains.

Your cities are already pretty dense. Maybe your threshold for "too many people" is very high, but in general Switzerland doesn't have much free real estate left in/around its urban centers and most people would probably prefer to keep the rural places rural. You could turn your cities into a highrise maze - does the majority of the population want to?

I can fully see where this initiative is coming from. If Czechia was pushing 20 million people, I would consider it on the edge of being overcrowded.