How useful is it to perform a systematic literature review?
A systematic literature review is never a bad thing. At the worst, you have a large database of literature that you can cite in future work. as well as a feeling for where the "low-hanging fruit" might lie. It will also give you a framework on which to build and grow your literature collection over time. 

So whether or not you are able to publish it, a literature review is a good thing (within reason—don't spend six months doing nothing but reading literature papers!).