I believe the exact opposite. We will see open source contributions skyrocket now. There are a ton of people who want to help and share their work, but technical ability was a major filter. If the barrier to entry is now lowered, expect to see many more people sharing stuff.
Yes, more people will be sharing stuff. And none of it will have long term staying power. Or do you honestly believe that a project like GCC or Linux would have been created and maintained over as long as they have been by the use of AI tools in the hands of noobs?
Technical ability is an absolute requirement for the production of quality work. If the signal drowns in the noise then we are much worse off than where we started.