I don't think prostitution nullifies consent just makes the environment in which consent is given different. And I feel more often than not, the environment and the power balance is not as stacked in the prostitute's favor as we'd like to hope.
As I see it prostitution will always occur. I'm just saying that it is a very different dynamic and I feel sometimes people make it more empowering to women than it is. I just feel that the power dynamics are so complex that it makes women vulnerable and the opposite of empowered int he long run.
However, I'm all for legalizing it and offering those women protection.
I think the latter, of legalizing it, and then regulating it, to put forth better conditions for the workers would do a lot to change that negative environment that is often associated with sex work.