I would hate it if the Gjallarhorn was brought back, because in year 1 it was too much of a straight forward way of getting things done. I prefer the new use of primaries and secondaries. Even if they do I would never use it nor would I buy it, and it would be generally useless except in the old raids and strikes. Rockets do no damage to Golgoroth or Oryx, maybe a little to the sisters and kinda Warpriest. I would find no use for it other than crucible and even then I'd rather just use Bad Juju