Good question and not the first time
Often when people ask about a "paint" finish cabinet they want to reduce costs, other times such as your request it has to do with the appearance solely.
On the cost front I can just say that it isn't that easy. The hardwood is integral to optimizing the sound. Yes it can be done with other materials, billet aluminum, stacked baltic birch, concrete, marble...you name it but it is always expensive and usually VERY heavy. Not to say that there are not good systems made with MDF and similar materials but they require a lot of bracing etc and again are heavy, the really good ones are not inexpensive.
That being said, to build these with a different material is a ground up redesign. I have ideas but the market for high end speakers has to improve for me to consider tooling up for that, and the final product would be several times the cost of what I am currently offering.
My response to the desire for a more "modern" look has been the Ebonized Walnut, we can choose wood for a more uniform dark grain with the result being a very elegant almost black speaker. You might consider that as you would have to spend many times the cost to get anywheres near that performance with Dynaudio, (who's top of the line speakers are excellent).