Go read this article from back in July where they specifically talk about your guardian going with you regardless of whether it's Destiny 1-4. They've stated many times Destiny will be a persistent world game. You won't lose your character.
[url]http://m.ign.com/articles/2014/07/21/destiny-will-likely-have-sequels-and-your-character-will-carry-over[/url]
[b]Update:[/b] Confirmed by Bungie. Progress 100% carries over to Destiny 2.
[url]http://www.playstationlifestyle.net/2014/12/08/destiny-character-progress-will-carry-destiny-sequel-bungie-confirms/[/url]
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Destiny 2 will be a Skyrim-esque single player campaign, where we all play Kabr. It will also feature dinosaurs. /facts