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Wild speculation, but my guess is that both will continue to be developed.

As far as I understand, the MLIR project predates its machine learning application and was originally intended as a new IR for clang. In that capacity it makes a lot of sense. MLIR is also currently experimental in Tensorflow, although I have no idea how mature the implementation is.

Similarly, there has been significant investment into Swift for Tensorflow, so it's probably here to stay. On the other hand, from a language design perspective Swift is not a particularly good choice for automatic differentiation and translation into Tensorflow graphs (imperative, exposing many details of the underlying machine, etc.). Without a lot of investment into this project it might just be overtaken by a better engineered competitor, or more likely, fail to gain sufficient mind-share over the "good enough" python solution that already exists.