Absolutely I think that speaker manufacturers should offer some variety. The basic black is great. But, what is the application where most speakers will be used? On a white wall? Can you imaging if most in-wall speakers were black instead of white!?!
Anyway, I think a 'raw' speaker would be a fantastic concept. Something where the end user could apply a varnish/stain to match their home. You could offer in-house application, or let the buy their color of choice, or they could go to Home Depot and pick it up themselves. Just a few protective plates to cover things that matter and let the customer make their speaker match their home perfectly.
No?
Then give me black, white, natural cherry, oak, and, dark cherry.