As long as architectural decisions have long-term costs and you need human taste and judgement to speculate on what business needs will come about in the next few years you'll still need human engineers.
We replaced most of our juniors and seniors at my company with AI.
We only have like 2 seniors down from 30 and they are more productive than ever.
I expect with Mythos we can get this down to at least 1 highly paid senior engineer and the rest a swarm of agents they are managing.