"LLM clones of eg Photoshop will end up being worthless, like ideas generally. The software will be worthless for the same reason ideas are: they're too easy. Users are hard, software will be (relatively) easy."
I doubt that. If a clone out there offers all the Photoshop's features for free or much lower cost, without additional learning curve, then many professionals will switch to save money.
McDonalds would be gone too if somebody opened a restaurant chain serving similar food for free or 80% lower price. But that's impossible to do profitably, while freeware software has existed for a long, long time.
Photoshop users could switch to GIMP tomorrow. They don't want to.
The many professionals are the ones that could most easily understand how to switch to GIMP, which is free to use. They could save enormous amounts of money. They prefer to spend money and stick with Photoshop instead. That has persisted for a very long time now.