It all seems rather desperate to me and unimaginative (children will love climbing over it!). This is not a structural way of disposing of these blades, it's a public relations effort.
The solution of using old rotor blades as structural material seems not badly suited to the scale of the problem. The global market for cheap lightweight and strong structural elements is far larger than the amount of rotor blades needing recycled. Just working out a nice design for an agricultural barn would probably cover it.
Also, modification for re-use is generally far less energy intensive than full recycling, even if it were currently available.