A minor of 14 or more years may prevent an appointment of a testamentary guardian for the minor from becoming effective, or may cause a previously accepted appointment to terminate, by filing with the court in which the will is probated a written objection to the appointment before it is accepted or within 30 days after notice of its acceptance. An objection may be withdrawn. An objection does not preclude appointment by the court in a proper proceeding of the testamentary nominee, or any other suitable person.