Get rid of commendations, Level 31 gear could only be bought:
A: if you beat VoG (majority of Destiny players haven't)
B: are level 30
C: iron Banner gear
Alternative RNG based:
D: lucky engram drop (but the cryptarch won't budge anyway)
Old gear would still be sold and there would be a new tab (L/R bumper) to change to the new gear. No commendations needed for old gear.
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It's too late. Everyone has already gotten 31 gear without beating VoG. Beating VoG or having a complete VoG set should have been a requirement to get level 31 gear from the beginning.