As someone else implied in their comment...

If execution no longer matters, then what possible ideas exist out there that both are highly valuable as well as only valuable to the first mover? If the second person to see the value in the idea can execute it in a weekend using AI tools, what value is there in the idea to begin with?

In fact the second mover advantage seems to me to be even larger than before. Let someone else get the first version out the door, then you just point your AI bot at the resulting product to copy it in a fraction of the time it took the original person to execute on it.

If anything, ideas seem to be even cheaper to me in this new world. It probably just moves what bits of execution matter even more towards sales and marketing and hype vs. executing on the actual product itself.

I think there might be some interesting spaces here opening up in the IP combined with "physical product" space. Where you need the idea as well as real-world practical manufacturing skills in order to execute. That will still be somewhat of a moat for a little while at least, but mostly at a scale where it's not worth an actual manufacturer from China to spin up a production line to compete with you at scale.