I (naturally) think that the article's summarily dismissing Haskell is unfortunate. It's probably just the result of poor PR on Haskell's part. Haskell is not only for surpassingly intelligent people, or even optimized for them. If anything, it's the opposite: one of its core tenants is that we're not smart enough to reason about our programs in most languages. Much of the design work focuses on unloading complexity…
Haskell discounts the very useful choice of reasoning about your code after it runs, favoring, instead, all-upfront reasoning, often at the expense of facilitating the former. There are some domains where figuring everything up front is very important. Others, where trial and error is far more productive.
Trying unfamiliar things is very good advice, but not for an important project you want done relatively quickly, and which you'd have to maintain for years to come.