Right now there’s no point in going out doing patrols and public events collecting chest or planetary materials. Adding a grandmaster mode that has higher tier drops like enhancement cores, exotics, or higher stat armor and weapons would bring a meaning back to patrols, you just stay in for as long as you like and other guardians patrolling by can hop in to and help. It shouldn’t give out loot on the scale that grandmasters does with all the ascendant shards and adept weapons, but it should be a good place to grind for exp, gear and enhancement materials. Possible higher level bounties as well.
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Tbh if it was on a new map that's larger and denser than anything we have, they could turn pvp on inside of it too and make it a lawless wasteland akin to Mad Max. Make enhancement cores, cranked up legendary drop rates, and cranked up XP the reason to brave the place. Add in some world bosses that are hard af to kill for adept versions of various world drop weapons. I wouldn't propose adding in higher exotic drop rates or prisms and shards, because nightfalls need to stay relevant, but I think an optional zone like this would be super fun.