Having already implemented these in game, if only visually, I don't think SE will get away with not making them usable. They are pretty much the most coveted weapon in FF history.

Honestly, Implementation could be as simple as adding a slow ranged auto-attack to weapons. Maybe a double attack on Crits or something.

Personally, I think Lightnings Blade looks like crap, but I also thought that whole game was crap. I'm all about VIII and Squall's Gunblade. I would do almost anything to get that on my Character, even if it meant I had to be a Gladiator.