So it should be implicitly pretty obvious that that meant "the license can fix things if FOSS developers actually use it", shouldn't it?
Huh? Whatchoo talking about, Willis?
If "only" 99% of FOSS developers used a truly freedom-preserving FOSS license, only 1% of FOS software could be taken non-free.
If "only" 90% of FOSS developers used a truly freedom-preserving FOSS license, only 10% of FOS software could be taken non-free.
Dunno where you draw the line of "works", but I'd say down to around 80/20 or perhaps even 70/30 would be "pretty much works".