Are you sure you haven't gotten your catastrophes crossed? Ozone depletion was a different crisis and people did enact change, the ozone hole has been closing fairly steadily. Wikipedia [0] thinks the prospects for the ozone layer are pretty good.
[0] https://en.wikipedia.org/wiki/Ozone_depletion#Prospects_of_o...
Some climate models expect permafrost decay and/or mere GHG rise to erode the ozone layer. It’s not 1:1 proven, but there’s indication that in a post-4C world (with feedback loops), we might slowly lose our protection against the sun’s radiation.
I don’t recommend getting into the literature, it’s… depressing.
(Your point about the global, concerted effort to limit the “holes” in the ozone layer reminds me that we can, when pressed, come together to tackle serious issues.)
If only climate change was as easy a solve
Ozone action occurred before the rise of social media.
We were fortunate. 20 years later and we’d have been screwed