Pharmaboy
Headphoneus Supremus
The wood will definitely darken. I think I got mine under 3 months ago and they've definitely darkened. I would think a darker stain would hide most of the beauty. Mine are the rose gold ones pictured on the site. The most beautiful headphones I own, until my next 2 ZMFs arrive at least!
Not all woods darken much, but some darken progressively & appreciably (ie, cherry). The key is light exposure. If you keep your headphones in a place with strong sunlight, even just portions of the day, more darkening will likely result.
My home office is very low light--never any direct sunlight. My 3 wooden earcup headphones (Ori, Eikon, Aeolus) are stored in drawers or hanging on the side of a desk in a dark corner of the room. With these conditions, I've seen no darkening at all in my oldest, the Ori (ormosia henryi wood).