Bungie should introduce Weekly and Monthly Bounties. They would need to be appropriately time-consuming for their time limit, and would need to have serious rewards. For Example:
Weekly Bounty - Reclaim Our Lands
Kill 100 Fallen and 100 Hive Majors on Earth
Reward - 10 Motes of Light
- 10 Strange Coins
- 10,000 Glimmer
- 1 Full Reputation Level Gain
Monthly Bounty - Unbreakable Striker
Complete 100 ROC Strikes without Dying
Reward - 15 Motes of Light
- 15 Strange Coins
- 15,000 Glimmer
- 5 Legendary Engrams
- 2 Full Reputation Level Gains
These are just rough numbers to convey the idea.
EDIT: A very valid addition was brought up, suggesting that Weekly and Monthly Crucible Bounties be included as well. I totally support that. ROUGH examples would be:
Weekly Bounty - Well Rounded Victor
Win 5 Rounds of Control, Clash, Skirmish, and Rumble
Rewards - (Equivalent Weekly Reward)
Monthly Bounty - Deadly Streaker
Earn 50 Killstreak Medals, and 5 Streak Medals for each weapon type
Rewards - (Equivalent Monthly Reward)
These would exist alongside the PVE style Weekly / Monthly Bounties to try to include both of the major Destiny communities. OR, to mitigate reward-overload, they could be launched separately every other month, or whatever would balance the system.
Rewards could get more creative than what I have posted, too. They could include ammo synths, weapon telemetries, x-number of class-specific upgrade materials, or whatever. They'd need to be something worth putting in a week's / month's worth of effort.