I made a little research about Olympic winners' blade (men):
1988: Yoo Nam Kyu (KOR) --> Don't know, most probably all wood since carbon was not popular back then.
1992: Jan-Ove Waldner (SWE) --> Even Waldner forgot (stated in his interview). Nowadays he is using carbon (Waldner Senso Carbon) but most probably he was using allwood.
1996: Liu Guoliang (CHN) --> Stiga Clipper (Allwood)
2000: Kong Linghui (CHN) --> Avalox P500 (Allwood). Later he used Kong Linghui Special with a carbon ply only in the backhand side.
2004: Ryu Seung-Min (KOR) --> 1-ply, thick hinoki blade (Allwood).
2008: Ma Lin (CHN) --> Yasaka Ma Lin Extra Offensive (Allwood).
2012: Zhang Jike (CHN) --> Butterfly Viscaria (Carbon).
Both allwood and carbon has been used by Olympic champs.
However, bty Viscaria got an Arylate Carbon which enhances feeling, damps vibration and combined with the balsa core actually make it feel rather woody. I don't know but I think human still need things natural
That's my little research.
Cheers,
Yosan