Speculative Assistive Futures explores assistive device design through the lens of the social, medical, and functional models of disability. The course critically examines technology abandonment, investigating the systemic and structural barriers that shape access, adoption, and long-term use of assistive technologies. Through speculative-participatory workshops with people with disabilities, students engage in co-design processes to create assistive devices that prioritize accessibility, empowerment, affordability, and stigma reduction, while balancing functionality, adaptability, and aesthetic integration. By combining hands-on design with critical inquiry, the course encourages students to envision alternative, more inclusive futures for assistive technologies.