Let more people group up for instances instead of having only 3 people for strikes and explore let a whole team of 6 go in an instance (or even 8 since 8 a playstation party maxes at 8) and let fire teams have their own instance and make it scale varying on how many people you have in fireteam. Cause alot of people I play with can't join cause we already have 3 people. On top of that clans also have more 3 people that wanna play together. So consider letting more than 3 man fire teams go in instances or own their own instance with scaled difficulty.
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If 1 person can complete a story round, having 6 would just end it more quickly unless they amped up the enemies powers.