Unfortunately it won't be your sniff test that matters. It's going to be an early founder that realizes they don't need to make that extra seed round hire, or the resource limited director that decides they can forgo that one head count and still deliver the product on time, or the in house team that realizes they no longer need a dedicated front end dev because, for their purposes, AI is good enough.
Personally, the team I lead is able to ship much faster with AI assistants than without, which means in practice we can out compete much larger teams in the same space.
Sure their are things that AI will always struggle with, but those things aren't merely "senior" in nature, they're much closer to the niche expert type of problems. Engineers working on generally cutting edge work will likely be in demand and hard to replace, but many others will very likely be impacted by AI from multiple directions.