Once your Wharton Domain account closes, your access to the student version of the MBA Career Management site will end. (See Graduating Students: Account Transition Information for the exact dates your access ends).
However, you have lifelong access to the alumni version of the MBA Career Management site, as well as lifelong access to CareerPath through this alumni career site.
MBA Career Management Alumni site: http://mbacareers.wharton.upenn.edu/alumni
For more on Alumni Services, visit the Alumni website: http://www.wharton.upenn.edu/alumni/