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Partially. Inverters providing virtual inertia is good but has the problem of still being active and reactive. It helps and is cheaper and more efficient than flywheels.
Flywheels and turbines however provide a very sticky frequency. They help out a lot with stability and give inverters time to respond.
Think balancing a stick on your hand vs anchoring it in clay.
If we take enough turbines off line we are still probably going to need some mechanical power stabilization no matter how inefficient.
But yeah I think we are going to see a blend using as much electrical and as little mechanical as possible.
Actually no. Batteries and thier inverter adapt in the about one second to half a second range. The massive inertia of a turbine adapts in the millisecond range.
To maintain 60 hz you need to be in the very low milliseconds range. Remember at 60 hz you do a full sin wave cycle in 16ms.
Turbines act as a tremendous power smoother in the grid.