Re: Another example that open souice is a flawed model...
"If open source eventuall dies"
There is a risk of conflating FOSS with open source software generally.
I personally don't believe FOSS is in any immediate danger of falling off the perch.
The value of open source software to customers versus closed source will always be an important consideration in choosing a product will likely lead to more businesses selling their software licenses with open source.
There has always been closed source software at no·cost to use/license for personal and/or educational use.
Ultimately it is a self correcting problem—if you use an unmaintained FOSS product to make a buck and that product requires urgent maintenance, you will have to find a substitute or arrange the rectification of the FOSS product (which, depending on the license, might oblige you to make available at a minimum to your customers.)
I suspect in the longer term there will be fewer people writing code (not because of AI either) so fewer programmers to donate to FOSS. Scientists and researchers have always (long before the internet) contributed their programs and libraries to their community and don't imagine that is likely to change. I would guess a lot of the code used in AI/LLM originated from such ML researchers.