On paper it's a really cool idea but when you think about it, they have 4 limit breaks now and you mostly see one, and sometimes another. As a bard, I've never used it. And I don't remember a tank LB.

So.. if they can't make 4 limit breaks relevant, they might struggle to provide one to every class.

The only way I could see it work would be to throw out the party limit break and let every character have their own individual limit breaks and bars. Maybe a buff or a big hit or something.