I think it will wall people off from software.

I don’t know what SaaS has to do with FOSS. The point of FOSS was to allow me to modify the software I run on my system. If the device drivers for some hardware I depend on are no longer supported by the company I bought it from, if it’s open source, I can modify and extend the software myself.

The Copy Left licenses ensure that I share my modifications back if I distribute them. It’s a thing for the public good.

Agent-based software development walls people off from that. Mostly by ensuring that the provenance of the code it generates is not known and by deskilling people so that they don’t know what to prompt or how to fix their code.