Warframe is adding a nice open world to the game. I've played the game a good bit and it's massively better than it was a few years ago. This might raise the bar even higher for D2 expectations for some players. I know a sizeable portion of the Destiny player base played Warframe and enjoyed it.
EDIT: I never said Destiny killer. I believe games tend to kill themselves. Ironic eh?
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I've played Warframe since beta and Destiny since y1. Both are good games but Destiny is better over all. Recently my Warframe broke and just to do campaign since the revamp on ps4 I am having to redo all of earth. I've never lost all my progress to an update in Destiny. Destiny you earn gear and weapons. Warframe you can do that but more people just buy stuff. As stated theyre both good games but I have always found destiny much better over all.