Just like for warships, the complexity and cost of building cutting edge hardware has grown exponentially up to a point where a significant chunk of the world's computing is dependent on 2 companies: ASML, TSMC. We shouldn't extrapolate linearly from examples from the 80s.
No, but I wouldn’t expect it to stagnate like with Intel in the 2010s either. Maybe the biggest caveat is that most people will be fine with using cloud providers, so the market for non-server hardware won’t be subject to as much competition.