Unfortunately I think your best bet will be to get a second console. bungie has said that they cannot do cross-gen play because of issues with the graphics. I believe the specific example was that a player who appears only 2 pixels on an old console could appear as 4 pixels on the newer consoles, thus making it unfair towards the older console (In pvp). Since bungie did not want to compromise how good it looks on newer consoles to match the older ones they had to make the split.
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Yea I will not be buying the same console twice because it just doesn't make sense to do that. But thx for the feedback.