^^ ah yes, the old "I like them right up until everyone else started to like them" mindset. It's a classic. Z is a good album. How does it possibly make a difference to you if a lot of other people also like it? What if all those hipsters then bought every other MMJ album because they liked Z so much? Would they still be d-bags?
Also, Jim doesn't expect "us" to call him anything because the majority of us will never say one word to him. Do you think Prince made his friends and family draw out his name symbol and hold it up to him when they wanted to get his attention? I have no idea what he is really like but I would think the people he actually talks to will still call him Jim. In conclusion, f'ing relax about his new name. It's not a big deal and has zero effect on the music that he'll produce under it.