I too love Jeff Hardy. I too hope he comes back to WWE someday.
There's 2 sides to it IMO.
Firstly, Aries has been awesome for TNA as Champion. Both X division and World Champion. He's one of if not the MVP for TNA, and he's one of the best all round packages in the business. Does he still need the title to be relevant? I don't think so, but as a heel champ, he's a great option for TNA to have as their title bearer. With that said, I'm not sure if it was time for him to drop the title, since the title run wasn't exactly getting stale (as far as I know).
Secondly though, Jeff Hardy does deserve this title win. He's overcome some big personal issues to be back to close to his best. After having him 'overcoming the odds' to win the BFG series, only to lose the title match perhaps wasn't the right thing to do. It was fitting if you like for him to win the title.
However, I agree with THBK in saying that perhaps Hardy was given the World title since his contract is running out soon. TNA don't want to lose their biggest face and merch seller, so with that in mind, and with the rumors that Hardy could consider a WWE return when his contract is up, then perhaps he was given this title run as a convincer.
I mean in all honesty, there's pros and cons. I'm very happy that Hardy is back to his best and back entertaining and doing well in life again. On the other hand, there's a question whether or not they took the title off Aries too soon.