Something like a simple story mission on a crucible level might be good. If they add little things like that here and there, they'll be able to keep peoples interest in the game alot longer than ARGs, especially so close back to back.
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Not sure how a mission that could be done in 10 minutes would retain anyone.
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People get bored of Destiny because they run out of things to do. New content, even just a tiny bit, always brings people back. Once people come back, they start doing bounties, daily/weeklies, and other activities and they end up sticking around for a while. It doesn't need to be huge, but little things here and there will bring people back. Coming up with new vanguard bounties every so often would be nice to keep things fresh too.
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Playing one game exclusively has that problem.
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I hop around between Destiny, Warframe, and Halo depending on what updates come out. I feel like Warframe is the only game that comes out with updates often enough to keep me playing constantly though. I'll usually have a single player game or two that I'm playing at a time as well.