I think Destiny 2 or Comet is going to really reshape how Destiny works in order for them to be able to make compelling additions. This is what I would do.
1. Replace ADS with alt fire for each weapon. Legendaries and exotic could have more unique and more powerful alt fire traits.
2. Replace grenades with long range class ability.
3. Replace melee with short range class abilities.
4. Allow for swapping subclasses without needing to go to the menu.
1. Replace ADS with alt fire for each weapon. Legendaries and exotic could have more unique and more powerful alt fire traits.
2. Replace grenades with long range class ability.
3. Replace melee with short range class abilities.
4. Allow for swapping subclasses without needing to go to the menu.