SYD
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The issue is the blades. They’re made from fibreglass / plastic / carbon composites. They get damaged or cracked and need to be replaced. The structural steel towers will last for years.Most turbines are 69% steel so absolutely could be melted down and reused there is no reason a smart cookie cant design turbines with a higher recyclable content they just haven't been incentivized to do so.
Although, I cannot imagine a wind farm in the Tasman Sea surviving the first winter “Tasman Low”. But I guess the UK and Northern Europe have some in the North Sea (an equally inhospitable stretch of ocean in foul weather).