I think that S3D is still great for professional use, and I do not embrace the line of thinking which leads to change for the sake of change.
Anyway in the last years are emerged a lot of useful functions (ex. gyroid infill) and new print strategies, it would be nice to see them implemented in a new S3D version.
But the long silence by the developers means only one thing: don't expect anything new, S3D will die or is (will be) acquired by some big company, leading to the same result.
Print happy while you can, and be prepared to switch to a different slicer!
R&D for 3D printers, materials & software.