(b) The court may modify an award of rehabilitative spousal support if a substantial change in the circumstances under which rehabilitative spousal support was granted warrants terminating, extending or modifying the award or replacing it with an award of permanent spousal support. In determining whether a substantial change of circumstances exists which would warrant a modification of a rehabilitative spousal support award, the court may consider a reassessment of the dependent spouse's potential work skills and the availability of a relevant job market, the dependent spouse's age, health and skills, the dependent spouse's ability or inability to meet the terms of the rehabilitative plan and other relevant factors as provided for in section 8-103 of this article.