This would be really nice for CAD designers, engineers,etc who are just starting up esp. starting their own business. If this can be made for less than $2500 with similar features to the high end Rapid prototypers/3D printers, I can see this helping out quite a decent amount of people in their jobs/business.
It's about time. The technology has been around for a long time. I don't know if they have a market though. Where I am, there are tons of rapid prototyping shops with day-after service. The technology (materials, printers, resolution) improves very quickly. I don't think I would invest in one unless it becomes my bread & butter. In my experiance, clients want the best quality prototypes - and the $2500 (or even the $15000) last year model will not deliver.
modeling and art...and perhaps, depending on how strong the material is, it can be used to make some spare parts for various things. a grill for a case fan, door handle, a cup holder attached to my monitor?
If these devices become cheaper to operate and own, they can be a god-sent for people that want to start selling hobby items like: model kit upgrade parts, unpainted figures, etc. Currently these require incredibly expensive injection molding dies or require labour intensive resin casting.