if planetside 2 can have like 100 people on a map then there's no reason bungie can't, this would be both awesome and hilarious at the same time because it would be a clusterblam with abilities flying everywhere, and if framerates an issue they made a pc version with a bunch of different graphics options so they could just dynamically scale it down and turn off some of the more useless effects such as DOF and foilage (oh no that one bush dissappeard, literally unplayable), besides, the destiny franchise hasn't really had a maximum player increase since moving away from last gen
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Patrols maybe... but why would you want 40 people in a raid? There are people that can barely get 6 people together for a raid, having a 40 person raid would only cater to large clans.