I think it's fine to make a fuss about Blackpool not just because of links to the world of Ballroom dancing, but because it's something fun for the couples to aim for in the few weeks before. Plus there is something special when we see the dancing on the huge dance floor with the huge chandeliers, etc. I imagine these days that back stage is mainly pretty shabby and it's more about faded grandure.
Apart from Halloween I would be happy to sweep themed weeks under the carpet, not because I don't like themed weeks but because of how bad the producers are at them!