The future of 3D printing is here, like it or not, and its only to get better, or not, we dont know for fact, but betting against it would be bad idea, so get on broad, or get left behind, its your choice .
You can make all the arguments about the cost you want, but guess what, there are people out there willing to pay to play, and just with everything else, the price will come down, you can set your watch to that, how much, again, we have to wait and see, so I dont get why people are still continuing to make excuses as to why 3D printing wont take off, I am pretty sure same the same things were said about the automobile, the airplane, and so on.
I know this is a hard concept, but life is moving forward, technology is moving forward, dont be afraid of 3D printing, embrace it, which I see very little of that here, people act as 3D printing is the devil, I have seen stuff model related 3D printed on other forums and its amazingly how far its already come, I cant wait to see where 3D printing is this time next year, I think we are lot closer then we all think.