Haskell has all the features of languages that become mainstream and mandated top-down on workplaces. I wouldn't be much surprised if in a decade people start complaining about Haskell-shops they way we complain about Java-shops now. (But then, no language could get there without a marketing budget...)
Haskell lets big teams collaborate very well, makes it hard to bad coders to destroy an entire project, consist in a good enough filter so that HR won't hire obscenely bad developers, gives enough space for software architects do their thing, and gives plenty of objectively measurable points to make managers happy.
That said, it's completely immature. Haskell lacks packaging, environment tools, and even a complete standard library (hell, I had to put a package[1] at Hackage because no available TLS library would work!). It has all kinds of interesting advanced features, but the basics are simply missing.