Missing skills
I think what the advocates of returning to wooden gliders are missing is there are very few people with the skill set to work with wooden structures.
Back in the days of the T21 wood structures had not long disappeared from RAF Service the DH vampire being an example the result of this was a knowlage base that could deal with the wooden gliders.
There was no of the RAF main stream operation of the glider type structures until the Grob 115 Tutor turned up ( and these are maintained under EASA145 by private contractors)
A return to wooden Aircraft would be a disaster due to the lack of understanding of the type of structures and how to repair and maintain them, is not the way forward............ I say this with some regret as my first flying training was on the Kirby cadet.