The idea that technological innovation is going to destroy the middle class isn’t exactly far fetched, it’s more just blatantly stupid. No economy has ever destroyed its middle class through technological innovation. This will never happen. Technological innovation is one of the primary factors that led to the rise of the middle class to begin with…
AI destroying the middle class will always be a political choice (i.e. the powerful have chosen some sort of hyper-extractive techno-feudalism). You could always tax the AI and redistribute the money back to the people affected.
What does have to be changed with the rise of AI is the tax laws. We basically should treat it the same as if an adversary was dumping product under cost (i.e. tax AI "work") and subsidize human workers; basically run a version of protectionism against AI - if we want human work in this post-AGI world to be viable.