Can a term employee be bumped out of a job by an indeterminate employee who has been laid off?

Yes, pursuant to Section 1.1.2 of the WFAD, departments are expected to carry out effective human resource planning to minimize the impact of work force adjustment situations on indeterminate employees, on the department and on the public service.  This could therefore include terminating term employees early before resorting to workforce adjustment of indeterminate employees.