I'd be shocked if it took off. The FOSS development paradigm seems to be allergic to good UI design, and this is far more important for people on mobile than desktop.
The problem in my eyes is plateauing. Once a project moves past the first couple of iterations, it rarely interests the original authors enough to make incremental improvements. And since there is no financial incentive to continue, the project usually cools down to eventually be replaced by the following iteration. This means that you rarely get mature software.