Open Source is not broken imho.
The challenge for single-maintainer projects is that they come to identify themselves with their project and that can create a toxic environment.
Its the same with other hobbies. If you are so into fishing/cycling/etc that you start to spend less and less time on your job/family/etc then things are also bound to blow up.
If you start a hobby you need to be able to draw a line on how much effort you put into it. And yes it will be tough to reduce/stop spending time on it. This is your masterpiece, your baby so to speak. But if you don't you have to accept the consequences.
Having said that, I feel sorry for the guy. But even if he would stop tomorrow the world will continue and solutions will be found.
"It is important to note that it still might not generate a unique value though the probability of that happening is fairly low."
It depends on your definition of "fairly". I would rather call:
"the number of random version-4 UUIDs which need to be generated in order to have a 50% probability of at least one collision is 2.71 quintillion ... This number is equivalent to generating 1 billion UUIDs per second for about 85 years. " extremely low ;-)
https://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_(random)