nobody wanted to actually maintain the legacy CUDA modules (that now live in contrib). NVIDIA certainly didn’t feel the need… and Intel, who are running OpenCV, weren’t going to spend money on that either. keeping those in the build got to be a chore.
so far, nothing has happened with those modules. I think nothing will happen with those modules. you would have to maintain those modules and produce builds of them… and keep at it, not just a one-off effort.
I would bet against seeing official builds that include the currently unmaintained legacy CUDA modules. I would also bet against seeing appreciable maintenance efforts of those modules, or interest/use.