I wish she could release singles. It's so weird that she doesn't and I wonder if it's Avex's decision or Ayu's not to release. I also think that they're thinking Ayu will sell because she is who she is. Personally I think that it's a stupid way to think because her sales just keep declining (which is normal, of course), and if she released singles her sales might be better, I believe.
So no, I think she shouldn't isolate herself from single market and just release albums because it will only make everyone forget her completely, and personally I really don't want that to happen to her. :<