They'll be back. They'll ALL be back!
(including me)
Yea, I still like to play the Daily PvP (2x) just to get to keep my skills somewhat there. And definitely will be in full force when the Spring update arrives. And if there's a good trials map.
Destiny is for casual gamers looking for an mmo-type shooter. A few RPG elements here and there but nothing crazy.
Division is a tactical cover-based shooter with a lot more depth in terms of RPG elements and customization options.
Both play really different and I know I'll be pumping in a ton of hours into the division as well.
They're fairly different indeed. I don't really see the replayability to go anywhere near Destiny, as some people in the Div OT suggests. Personally, I enjoy PvP, especially when there's tiny to no lag, and I can do that anytime I want, for as long as I want. I don't see that being the case for Division. Once the content runs out then it'll be pretty much done until the DLC, which I'm perfectly fine with.
In terms of casuals, I disagree with that. There are a TON of hardcore, which is basically everyone that's still here today.
Here's mine for example:
1232h - 262h deleted (RIP MY MAIN WARLOCK, SUPER SAD FACE)
Makes up 7 weeks 2 days 8 hours 47 minutes 32 seconds.
6 active and 1 deleted characters.
Also Destiny has Classes, meaning more chars. Division, only 1 char and I don't see the need for more chars. Which means for Destiny, if you do PvE, some things are done 3x haha.