I think the issue I'm trying to get at - I suspect there is less value in null proving a lot of social science hypotheses - the impacts are smaller than physical constants of the universe (or finding say, that the Higgs Boson didn't exist) - if I prove, because my empirical work says so, that discourse can be meaningfully (for a given value of meaningful...) analysed in a new way, that's great, and will advance some other work. But proving (even repeatedly) that it can't be won't really change anything, imo.
I guess though, the main issue is: I'm sure as hell not going to get published saying it, which ties back nicely to the point made in Nature, really.