> The agentic age is, I hope, going to question a lot of old assumptions & needs about what we want to run.

There's no reason to think that "the agentic age" will bring about any runtime efficiency. It may, perhaps, reduce development time but it doesn't introduce any new incentive to make software more efficient. It may happen, in a very roundabout way, by making consumer RAM massively more expensive which might induce customers to choose more efficient software, but it's too early to tell if this effect if happening.