Not at all. Bards are about being flashy and loud / noisy, while Rogues are about stealth and such.
You don't need to have a Bard character concept as a pure supporter - but adding support value either as buff for your group in heal spec or debuffer of enemies as DPS spec would work out fine. I had the impression, that BfA is a bit more "back to the root", with returning specific class utility like raid buffs. Again, a good opportunity to introduce this new class.
With the concept of Necromancer and DK being like Priest and Paladin classes, this could probably work out. But I don't know if this would not butcher the Warlock class even more, than the addition of DH already did. And I don't trust Blizzard anymore in this regard. Tinker or Bard would be less complicated.