Javascript tools and runtimes are growing up very fast; it'll probably go on to surpass Erlang for this purpose if the libs are stable enough.
I don't know whether to laugh or to cry... Node/JS may replace EventMachine/Ruby or Twisted/Python for quickly whipping up an evented app or service, but it will be quite a while before anyone would consider moving an erlang project to node. Node is little threat to the distributed, fault-tolerant, concurrent niche that Erlang occupies -- within that realm there is nothing you can do in node that can't be done better in erlang and a great deal of bulletproof infrastructure in the frameworks built up around erlang and its vm that node will never come close to.