I don't think it's as hard as people think to get people to do Strictly. It's good publicity (in most cases), and they are paid decently for 3-4 months of what is mostly, fun work. The myth that people are reluctant to do it because of the 'strictly curse' is just nonsense.
Rebecca Adlington is another one who's wanted to do Strictly for years. I think the producers are very selective with who they have on the show, and they always need a mix of sportspeople, soap stars, pop stars, comedians etc etc.
This year there was:
Actors - Charles, Danny (2)
Pop stars - Faye, Ashley, Lee (3)
Comedian - Sean (1)
TV personalities - Dr Ranj, Stacey, Katie, Susannah, Kate (5)
Radio star - Vick (1)
Sports people - Graeme, Lauren (2)
Other - Joe (1)
So a good mix