By increasing professors, homework tasks to be attended will increase further and therefore students attending lecturers will also increase, even if students won't increase, still homework posts written will increase by existing writers. Let me tell you how, suppose i as a writer attending homework tasks, used to write 5 posts out of 5 . When professors will increase I'll write 8 . Same is case with other writers. So the burden on existing professors is not lessened too much. May be it may reduce a bit just because all writer's don't attempt all posts. But i believe it won't be that much. So betrer is to recruiting competent assistant professors for each professor who will share checking so as to reduce burden on them.