I put Major Importance, because I think it's going to be one of those "critical mass" type things, much as the personal computer was. Initially they were bash-kits for homebrew enthusiasts. Not terribly useful, but fun to tinker on. Gradually, as the market for them steadily grew to include small businesses and affluent early-adopters, you have companies like Apple, Sinclair and Commodore arise to fill that niche, and you had IBM (an established computer giant) creating them as well.
From that, it follow that some of the high-end printer manufacturers might throw their hat into the ring over the next few years and debut 3D printers.
Expect a confusing morass of conflicting/competing standards, entire cottage industries of secondary suppliers (polylactic acid cartridge refillers, anyone?) and a tangle of compatibility headaches.
And then at some point, it's going to become A Big Deal(TM), and like most tech products you'll wind up with a few big boys, an few open source alternatives, and a growing userbase.
It's the ripple effects that I'm most interested in. When you can print something by downloading a design you like (for a microtransactional fee, like an app) and then choose your color based on the dyes you have available and spit out your own made-to-order what-have-yous.....what happens to the retailing industry? Does everyone just sit around all day toying with CAD programs and designing shit? I'm thinking a bit here of Second Life and how the number one activity for most people there is designing things to sell to other users, for virtual money to use to buy things others people have designed.
And in an economy like that, what happens to the people who simply can't hack it as "the creative class"? Are they stuck being the poor schlep who fills plastic cartridges all day?