Being aware that I may be accused of being flippant, my advice would be to avoid this topic altogether as you may be on a hiding to nothing unless you have been thinking about the topic for the last couple of years, and been gathering information along the way. By asking your question my initial response is that you aren't really invested in the topic.
My advice to undergraduate dissertation students is to keep it simple. After all, you only have a few months to get it all together. Some of the best dissertations I have supervised, moderated etc. have been on topics which, on the surface, might appear simplistic or 'easy' (e.g. looking at reviews of a dance work by different dance critics across different decades - do you see what I see?, or the impact of different forms of feedback on a student's self concepts - thus, teachers needing to be aware of the effect of feedback on students, and strategies which students can draw on in mitigating negative impact). The success indicators of these 'simple' dissertations were robust research questions, lines of enquiry which were critical and challenging, a methodological framework which was informed and credible, and identification/justification of emerging messages/trends. I'm sure your Supervisor will advise accordingly.