The more you have of them , the more these machines will break down. Windmills and the current wind turbines break down with regularity. There is no getting around this as long as gravity and friction exists . You cannot thwart the science of basic earthly physical principals. Can you imagine having turbines in an ocean environment?
Turbines are and never will be as trouble free as say, a flat monocrystalline solar panel. In either case, wind turbines and solar panels are LOW DENSITY generators. They will never replace dense sources such as fossil fuels , nuclear , hydro and biomass for that matter, which also use turbines for generation as well. Land based turbines are much easier to repair than a tower mounted monstrosity in an isolated area however, or at sea for that matter. (As a matter of fact, wind turbines are modified fossil fuel burners).
Until politicians and citizens realize that science rules, not politics , this absurdity will cost society too much and will eventually be abandoned by present and future dense sources.
How much damage will be created environmentally and economically along the way by this archaic technology is the only question.
See Clyde MacDonald's great testimony about a basic wind turbine issue for too long neglected. Fires, created by friction and electron movement.