Well you know that Stratasys and 3D systems will be up there for a while. I think it's possible a larger company could buy them out, or even possible that the two will merge at some point.

As for HP, they need to make a move soon if they have hopes of making a dent in the 3d printing industry. Sure they have a lot of assets at their disposal, and a name that is synonymous with printing. However, they still need to act before it's too late.