The 1.0 opening movie where people are in the inn browsing through leves features people walking around with Great Swords on their backs. So it's not entirely far fetched.

The terribly restrictive archaic Armoury System on the other hand. SE already mentioned there would not be any two-handed swords for Gladiator since it would require too much to animate. (And alternatively, though not spoken, they're gonna run out of weapon options soon for new jobs since they didnt think the system through at all, what's left? Rapiers? Great Swords? and then what... oops, all out of options >.>)

And despite Raubahn dual-wielding and being a Gladiator, i dont think we're ever going to get that option. Again due to having to re-animate a lot of things.