Hmm,

Seems that if they change to yellow there will just as quickly be a group formed for bring "Bring back the blue" for X reason, it could even be as simple as "I(We) like it better".

Where do you draw a line?

Potentially there is a danger of say %5 of customers making lots of noise in forums and such, while 95% are actually quite happy, the 5% influences change to suit themselves, which adds price point cost to the whole who don't see it as a major issue at all.

There are always customer demands for many different things. Some realistic, some not so much. 

The greatest danger is that after implementing the change the 5% wanted is that they will be well plussed with their success, but the 95% may pack up and leave saying we liked it better before and while you messed around on changing that, the competition has implemented a game changer. Effectively giving the customer what "they' wanted could potentially decimate the market.  In DS's case, would customers be happy to wait an extra 6-12 months more for an upgraded just to get a forest devouring print me manual released along side of the upgrade? Scaling this out it's a major cost development wise (and to the world's forests ;)), DS could in 5 years be at the same Development level without manuals, as It would be in 10 years with a stack of redundant manuals chewing resources of the development team. 

Again personally I would prefer to see Daz Studio developers invest time into developing the software rather than writing bible style guides that as quick as they're published tend to become redundant. But everyone has a preference.