Burnination is the remedy for widely-used tags that we don't want. It's an alternative to editing it out of all the questions. So that's not what we're looking for here; if there are one or two uses of a tag and that tag needs to go away, just edit the questions.
Infrequently-used is not the same as unneeded; it's possible to have a specialized tag that sees little traffic. I'm not saying that's the case here, just that it's possible.
Tags with only one use and no tag wiki are auto-destroyed after a while (I think six months but I might be wrong about that). The way to preserve a valuable tag that is, or risks becoming, single-use is to write a good tag wiki for it.
I am not surprised that we have redundant tags; every beta goes through an initial burst of tags followed by a rationalization/cleanup of them. Those should be cleaned up. If you know what needs to be done, please just do it -- your edit will bump the question and if others disagree, they can respond. (Please don't do so many at once that your earlier edits -- and other people's new posts -- get buried.) If you're not sure what to do, please bring it to meta.
Thanks for your efforts to improve our tags. Fixing this not only helps organize existing content but makes it clearer where new stuff -- both questions and new tags -- should go.