Just a thought, if Ducky can't continue as an ME, maybe he goes to the new show as the profiler, its not uncommon to take members of the old show to a spin off to ensure viewership
What do you think?
I think Tony is leaving for the new show too, that's why they are trying to make McGee seem more macho and less geeky, that was the whole conversation with Abby about adding new layers and not losing old ones