I like Erlang, but in shops I've worked with that have your "average" dev in it, it's syntax and semantics would be something they struggle with (if it ain't PHP, they'll struggle with it...). Unfortunately I don't blame them. That said, I think if they truly needed to build a somewhat stateful concurrent router, Erlang is a better choice (solely because it's battle tested in those highly concurrent workloads). Picking tech for big things like this when you have to balance a teams knowledge with the right tool is a hard problem in my experience.
I agree, but if you want to learn something today then GO would fit better for the task at hand and easier to learn. That and the cost involved is really good value given the training involved with learning Scala over GO.
That and I suspect there was some wishlists on what people wanted to do in the mix, like COBOL, still used but people just do not want to learn that as it is deemed so last century in comparsision to say java, though they are altogether different fish. Bit like the difference between a proxy and a router, what sounds better on a CV.
I suspect that from a maintenance aspect that the GO code will be much easier to support and grow as and when needed as well as scaleability.
Still it is most encouraging to see such a young language like GO get so much respect and use so quickly in a enviroment that has to many in the past and present been slow to adapts new technology. But there again many Govermental departments still have XP, albeit used as a fancy terminal to some old mainframe application that just ticks along.