I think that would be ok as well. Currently, the Off-Topic Music board doesn't have that much constant new topics, so I guess that serves as an example for a hypothetycal Movies or Videogames board (didn't remember this before!).
So in the end, what could be done is transforming the Music board into Entertainment board right? That sounds good
Besides, honestly, the current Music board is pretty much just the CLT topic, so I guess the space could be put to better use.