I lost all faith in humanity in 2020. I still can't believe people can be that stupid. We won't be able to safe ecology when people can't follow simple rules.
I'm not sure what people expected to happen when we started producing billions of disposable masks and distributing them to everyone instead of just medical staff that have to follow disposal procedures. This shit happens with literally all of our single-use disposable garbage. Any system that requires billions of individual people to follow rules that inconvenience them without any sort of enforcement or consequence…
There might be issues with reusing masks (I haven't seen any data on this).
This is more like one of those problems you sort out later and worry about it less when it's happening. The one thing I'd propose is do what we can to not use synthetics in them so they'll at least biodegrade.