> "Messrs" is pretty old fashioned language. It's uncommon to see it in modern use.
Though it may be part of the WSJ's house style, so you might see it in its pages quote a bit (the paywall means I don't read it enough to know). For a similar example, see the New Yorker's continued archaic use of the diaeresis:
I know I'm reading a New Yorker quote when I see the superfluous diaeresis in coördination or a similar word. Some words, such as Noël, have a legitimate reason due to counterintuitive pronunciation or as a sign of its archaicness.
In any other context, I mostly think of Spinal Tap.
Though it may be part of the WSJ's house style, so you might see it in its pages quote a bit (the paywall means I don't read it enough to know). For a similar example, see the New Yorker's continued archaic use of the diaeresis:
https://en.wikipedia.org/wiki/Diaeresis_(diacritic)#English