I very much doubt pvp is the only way to reach the new cap, this would take out the majority of the player base. This I can't confirm just my thoughts on it.
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We don't need confirmation. You're 100% correct. The idea behind PoE is more ways for people to get max gear. Same reason CE drops armor much more freely than VoG did. People complained they can't be max level so Bungie is trying to provide more diverse and at times easier ways for people to get there.