Centaur chess did reign for a while. For AlphaZero, which has a strong ability to perform pattern recognition based on experience in a limited domain, humans may not be able to add value to its play.

That said, most board games are a very limited domain. Even more complex computer games prove more challenging than the current AI approach can handle without weaknesses (see comments about Dota on this page).

In complex real-world domains, humans can definitely still add much value relative to computers working by themselves.