Releasing a large expansion would be a terrible idea when trying to compete with borderlands 3.
Annual pass is bungie best bet.
To draw players in the months after borderlands has had time to be played
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Maybe? Personally D1 started to flourish after The Taken King and Rise of Iron. Its definitely better after forsaken. But it has also been nice getting more frequent content drops. B3 is just too different to compare. I doubt it will kill destiny. Except for those of us who want a more extensive campaign.