It would be awesome to have JJ, but it is not happening. If it was it would be for a small stint. So, recast.
Not that Joss helps, but I don't think it's because of her that Cam is snoozeville lately. Spencer has Nik to bounce off of and Cam should have Lucky. As fantastically written, and as fantastic as the chem was, Lucky and Liz would not have been as wonderful as they were without the family dynamics, neither would Lucky and Nikolas have been as individual characters without that.