I think mic skills are something you have naturally, not something that can be taught. I don't think AJ will ever be good on the mic.
As for Jeff Jarrett -dear God, no!
I'm hoping that with TNA hitting the road, the ghost of Double J haunting the impact zone will finally be over. Jarrett may be a founder, but he lacks humility. He made himself the center of EVERY storyline, and a 6-time word champion in just 4 years.
If I never see Jarrett again, it will be too soon.