Bring every single Nightfall weapon into the weekly rotations, instead of just the current 6.
This is going to be a [i][b]very long[/b][/i] season, and this would give more-of-a reason for people to log in atleast once a week, as well as give people the ability to finally complete and finish their Nightfall + Adept Weapons / Collections before The Final Shape hits, along with people to have another chance at weapons they missed in the past.
Just my two cents.
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This would also mean a much larger rotation (iE longer time to cycle through all of them in case you missed a single week). At another note we also had 2 weapons per week in previous seasons which was terrible for farming. This season will need content, but shoving nightfall weapons to inflate the rotation size won't be helping that.