There are three companies I'm aware of in the United States who have commercialized, and are, today, right now, recycling turbine blades.
Additionally, there are multiple startups in both the US and Europe who have developed more easily recyclable blades and those are starting to be deployed.
Blade lifecycle is a solvable problem.
The steel in the gearboxes is a problem that solves itself.
It's really a non-issue compared to burning the remainder of fossil fuels (everything still buried).
We're basically talking about huge glass reinforced resin cylinders and non-flat sheets here. I can think of tons of potential uses at the right price.
Any screeching about quality or defects can pretty much be overcome by just using more since they're waste after all.
You can't use the entire blade: for one they're ridiculously huge and have a very inconvenient shape. You'd have to hire people to cut them up, test each segment for defects, and somehow find buyers for randomly shaped offcuts. It'd probably cost a lot more than grinding them up into powders that already have commercial use.
No one would want the used sections. They're pre-damaged and would come at the same or higher cost than new. At the same time, new material gives you the choice over size and shape. I don't see it as a really practical solution.
Some things just can't be reused, so we have to break it back down to raw materials and recycle it. That's about the best you can expect from something intended to be a consumable replacement part.