So when the "big expansion" arrives in Spring 2016 and has "significant light level increase", all you people who sweated through the raid grind for months and months to get to that precious, [i]cosmetic[/i] light level of 320, how will you feel when any joe guardian can waltz into the tower and buy 320 light level gear? OK TTK wasn't quite that generous, but that is how all the Y1 DLC expansions were.
I'll not be happy to become 320, not that it matters much, since the increasing of light level with every expansion (2-3 times a year) invalidates your in-game progression that you feel like you have earned. After 3 such cycles (going into our 4th light level increase), it is pretty clearly pointless.
Countdown to the bitching and moaning:
3....2....1....SALT!
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Vendor gear is more likely to be 300 or 310. Unless they boost the light cap by 30+ then I could easily see vendor gear being 320. Either way it doesn't matter to me.