Should be one Package and possibility to buy the extra (deluxe) expansions if you want them.
Do not forget that Destiny 2 is a live service game, so when the servers goes offline it's bye bye D2!
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What you are asking for is quite literally how it works already...
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It was in one package. WQ Deluxe + Anniversary was on sale as a bundle for months for $100.
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And that won't be happening anytime soon. D1 is still online...