1. Saying that AI will never approach its theoretical limits because XYZ tech is approaching diminishing returns, is like saying guns would never get better than the fire sticks of China in 1000 AD because the then-current methods hit their theoretical limits. You're betting against tens of thousands of the smartest minds of a generation across the entire planet. I will happily take the other side of this bet.
2. Sure, depends on #1. But the incentive is undeniable.
3. It has. Do you think people are using Claude Code in incredible numbers for no reason?
4. The public and businesses are adopting AI en masse. It's incredibly useful. Demand is skyrocketing. I don't think you could show that negative public sentiment has been sufficient to stop this, any more than negative sentiment about TVs, headphones, bicycles, etc (which was significant).
With the exception of #1, I feel like you're arguing that things won't happen, where the numbers show they've already have happened and are accelerating.