There's a difference between what can be done right now well w/ 3D printing and what we will see "later". When you look at historical wargaming you are often dealing with a very different set of surfaces than you are with 28mm fantasy figures. The former lend themselves better for 3d printing.
http://www.shapeways.com/model/1155418/1-144-fokker-dr-1-x4.html?li=shop-results&materialId=6In time it will reach the point of what we use but I don't think anyone needs to worry too soon.
As for the pre-colored options, they will appeal to some gamers but not others. As mentioned by others when we play locally I see a lot of 40K and other players just use raw grey models on the table. So at least if they were pre-colored it wouldn't look as bad.
We do sometimes use raw models for a game or two but nearly all of us try not to use unpainted models much.
3D printed w/ color will never look as good as "pre painted" (picture what they do with the X-Wing, Wings of Glory and Sails of Glory games if you know any of those), and pre-painted will never look as good as what a skilled painter can do by hand. But a lot of casual gamers enjoy the play hobby without much interest in the build/paint side, just as we have people here that do great things with the painting but don't play (much).