[JCraig]

With only 2% of visitors coming from mobile, why would they go mobile-first?

Sure, the design of the site might limit mobile use a bit, but it probably wouldn't cause that big of a disparity in and of itself.

Also, the post mentioned good reasons to go responsive or mobile-first and said that the benefits to a fixed layout for most pages outweighed the drawbacks for them. They have even optimized some pages for mobile where it makes sense to them.

Doing what is right for your business is more important than jumping on the newest techniques solely to be seen as "innovative".