There were more than enough Democrats in Congress in 2008 to make that happen.
There are more than enough Democrats now to make it enough of an issue that it becomes part of the public conversation.
There are more than enough Democrats now that could make an internal party rule that prohibits Democrats from ever lobbying for pharmaceutical or insurance companies.
However, the Democratic Party is far more motivated to kneecap actual healthcare reforms than actually implement what they say they believe in.