I'd say its sad that they're giving into market pressure, hopefully it doesn't mean the quality of their products (and included accessories) declines. Every Noctua product I've bought has always been a "wow" experience when unboxing. Beautifully packaged (albeit a tad wasteful) and having all the voltage step-down adapters and extension cables included has meant I've never had to buy such things. I can't say that about any other fan or heatsink I've bought.
They have a fairly iconic brand today, one quick glance and you know it's Noctua. Moving to black means they just become another generic fan or heatsink. They'll definitely be losing out on free marketing now and will have to advertise, get sponsored reviews, etc.
This X10! Premium quality, premium product, and immediately identifiable.