If the downward trend continues with Destiny 2 content it will be replaced. At the moment a lot of your playerbase is flocking to Borderlands 4. It's new, not recycled (as much), the reward system is a little more , well, rewarding, it has a story, and yes being a new release it has it's fair share of issues. However those issues seem minor compared to the compiling trash heap Destiny 2 is becoming... I love this game, but not as much as I want to as it stands now. You will have to reach pretty deep to bring us back, failing to reach far enough will only further push us away.
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In my case is worse than that: they've (mostly) lost me to old games: Arkham Knight and Bloodborne depending on how much time I have available. I will be back to check the next event though and if - like Reclaim - it does not spark joy, I will just play something else until the next event. Seems to work for me while the game is in its current state.