Elixir.<p>The frontend world is gravitating more and more towards functional stuff, so let's go straight for the real thing. The actor based model of the VM should also <i>greatly</i> help to achieve concurrent/parallel/distributed stuff. Plus one could design awesome DSLs through Elixir macros.<p>But I guess everyone has at least one opinion why his/her fav language should be in.<p>The most interesting part would be (given that a BEAM VM runs natively in the browser/tab) what people would build with the power of <i>linkable</i> VMs. I'd be very curious!