I don't think it will be the same demand as Bard was in FFXI because they aren't quite the same, although they are very similar.
Bard will be able to provide group buffs which will undoubtedly be useful for tackling larger group content. They provide buffs that other classes cannot, whilst still being able to do damage and not pigeon holed into rotating songs all day. They do just fine in smaller content like dungeons but I have little experience elsewhere in the relaunch. Time will tell!