Mariah has vocal nodes, but she is hesitant to get them removed because the surgery is very risky. Even if she can still sing, her voice could sound drastically different than it does even now.. Her whistle register could be completely gone. Personally, I think she should record a bunch of material and have the surgery. If something goes wrong, she can release back material, not perform, and just retire..

If the surgery goes right then she will be able to control her voice better and sound more like her old self.