Its gonna be a different meta. Shorter time to kill will definitely make the mid and higher ROF pulses good maybe even the low rate of fire pulses as well depending on how many headshots/bodyshots you need for kill, I forsee the same type of meta with beginning of Taken King, its gonna be the mid/fast ROF pulses, and on PC its gonna be pulses+HC.
Then with the ammo and weapon changes shotties will be back with a vengeance.
Its gonna be fun to watch the new metas emerge. Right now the low ROF pulses, the 390s and lower are 3 bursts if you land mostly head shots. Will these become 2 burst? Probably not but im hoping so. As to the new broadsword, it should still be really good. Doing the same DMG as the 390 ROF pulse at 540 RPM? Yeah this thing will still be god weapon with that perk active.
I hope the graviton dies, as well as a well needed nerf to Vigilance wing. This whole meta needs to die. Every match is literally flooded with graviton and vigilance. Maybe a few HCs on PC.