If it were alive and well like you said, then why do issues we've had since September still exist? matchmaking, weapon balancing, etc? If it were alive and well then, why has your god almighty developers ditch it and started working on a reboot instead to sticking to the steady trickle of content for 10 years as promised? Maybe not so alive no is it.
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I'm going to explain this as simply as I can for you: Destiny 2 is part of their ten year plan for the Destiny franchise. It will be new content. Hopefully you can wrap your mind around that.