Read this: http://www.24fightingchickens.com/20...a-karate-club/
It's about karate, but the advise applies equally to aikido.
I recently was in a similar situation and decided to leave the dojo I had trained at for 7 years. As I see it, what you propose will just create unnecessary drama. Just leave quietly and don't look back. That is the best thing for you, the old dojo and wherever you choose to train in the future.