No worry, my intent is not at all to make a viewer, it's a segmentation plugin. It's just that I needed an efficient viewer for point clouds, and 3DViewer was not modular enough to make what I wanted. Thus I developed one, but I would have preferred to spend some time on something else.
So I'm happy to learn there will be a new nicely maintained ThreeDViewer. If I have time (and depending of the usefulness of my plugin), I will remove my internal viewer and use yours.