Re: Switching Arts
If you have senior students, then they must be quite happy with what you are teaching. My suggestion is, if they want to continue, keep teaching them Jiu Jitsu, but be open with them about where it comes from and do not try to teach them aikido for a few years, until your teacher is happy with you doing so. As Mary said, that could take quite a long time.
As the the style, I would rather learn from a good teacher in a style that I don't like so much in the abstract than from a bad teacher in a style I am interested in. Just check out what dojos are available and see which one you like.