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Elixir/Erlang's emphasis on uptime/fault-tolerance/scalability/concurrency (admittedly at the cost of performance and the abstraction of a VM) is perfectly suited to web/mobile use-cases.

On paper, Pheonix should be the default choice for large and small web/mobile MVC applications. I think the question of if that becomes the case is directly tied to adoption of Elixir.

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The performance comparison matters if you start comparing nginx, and maybe even the Go/Rust frameworks, but it absolutely blows Rails out of the water for performance without sacrificing any of the high-level abstraction goodness that makes Rails appealing. No reason not to move to Elixir unless you cant hack functional programming IMO

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