I think it will be twofold. On the one hand, there will be developers who use the most high level languages available and will do what you said: manage require

I think it will be twofold. On the one hand, there will be developers who use the most high level languages available and will do what you said: manage requirements, complexity and ambiguity while being able to find workarounds for the cases where performance would not be enough (there will always be these cases). On the other hand, there will be people who specialize in building the foundations for the former developers. They will write high performant algorithms and datastructures and optimize code for devices where resources are scarce.