I don’t think she should do it. But not for any reason mentioned here. They used Bristol to get the ratings and then they screwed her chances to win in the end by changing the rules so that the judges decided who won and not the voters. Because, heaven forbid she should have won.
So, no. DWTS has gotten enough ratings off conservatives.
I don't think Christine should do it either, especially if she really has two left feet. Kate Gosselin had two left feet, and she was widely mocked.