The blades themselves isn't really much of an issue if you actually compare it to fossil fuels - for example, coal fly ash was 18% of all waste generated in Australia around 2019 (this is likely a bit less now as one or two major coal plants have since been decommissioned).

I think it's astronomically unlikely that wind turbine blades would ever be that kind of proportion of a country's waste, but it was just a normal thing for coal. And gas and oil have a similar problem, it's just harder to see since it's fine particulate matter belched into the air instead of heavier ash that you have to deal with!

1. https://www.abc.net.au/news/2019-03-10/coal-ash-has-become-o...