Ayu has no competition.
she does her thing...releases when she wants...makes the music she wants...She's doing what she does. It keeps her fans happy, to hell with everyone else.
Her music is still timeless...she still captivates new people constantly...She's just Ayu. She can't be anyone else...she doesn't have to be. If people don't like her for being who she is, then maybe she doesn't even want them as fans anyway.