Some kind of grand scale weekly or weekend activity to breathe life back into patrolling, besides the daily bounty. For example:
Collectively, players tally 1,000,000 Fallen kills on patrol in the Cosmodrome. .. for a couple hours, the 'drome is clear of enemies, humanity flourishes... then suddenly they return in a massive invasion, continuous waves of drop ships, increased enemy level, aggression, and chance of majors and ultras spawning, and engram drops.
I'd make sure to do that every week before reset, too.
Edit: Adding #CommunityWishList
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INVASION BUMP!