You're the one who introduced "collapse of the entire ecosystem," nobody that you've replied mentioned it.

We would lose a lot if denied access to orbit. For example, satellite communications, intel satellites would be gone, as well as weather satellites. Imagine the impact that would have on weather models and forecasting, and by extension farm productivity. Google Maps and the like would rapidly become out of date, and satellite phones would no longer work.

It'd be a disaster and while I'm sure we'd find ways to mitigate many aspects of it, there would still be a serious impact on our entire civilization.