There even are efforts to recycle existing ones: https://www.offshorewind.biz/2023/02/08/newly-discovered-che...
In most advanced nations landfilling them is prohibited, and many are now burnt in cement kilns.
The US produces hundreds of millions of tons of construction and demolition waste per year.
My biggest concern with wind is not the blades, it's concrete foundations and perhaps steel. Concrete inherently releases CO2 when produced (from calcining of limestone), even if the energy source is non-fossil. Nuclear also faces this issue, of course. PV doesn't typically use concrete footers these days, instead using steel anchors that go directly into the ground.
There are plans to make lime from silicates, but this is not a mature technology.
