I'm not big on conspiracy theories, but hell, I'll do this as food for thought.
Coriolan Conspiracy Timeline :
1998 - Guerlain releases Coriolan for Men - Fresh Citrus Fougere Green Aromatic Herbaceous(Basil) Spicy Leathery Chypre Floral(Immortelle) Woody(Juniper) Ambery Patchouli Musky Mossy(Oakmoss) Ciste-Labdanum
2000 - Vetiver is revamped to the current version
2001 - IFRA standards restrictes oakmoss to 0.1% concentration
2002 - Coriolan discontinued
2007 - Mitsouko, now a shadow of its former self, released as a reformulated version with oakmoss substitute
2007 - Coriolan mysteriosly reappears as L'Âme d'Un Héros under Les Parisiennes collection
2009 - Forthcoming 43rd IFRA Amendment (2009) will further restrict the use of oakmoss
Was Coriolan's fate due to poor sales, or did Guerlain decide to pull it off the shelves due to the tightening of restrictions on oakmoss? Will the scent of oakmoss no longer have a place in the future of perfumery?