No, that's not sarcasm. That's brutal, honest truth. Anyone who even thinks said rewards will entice people to try PvP will systematically be abused into knowing how drastically one type of play can be to another.
Then again, what do I know!? I never PvP!
I could be considered a casual pvper if casual means playing only occasionally with no real drive to compete. I do it to test new weapon/build configurations or to help learn a profession. The current rewards are definitely not a draw - with the exception of some titles. It has no impact on pve - I gain no abilities or usable boons or weapon skins.
If the update does mean pvp rewards will be of some use in pve I def. think more people will be trying out pvp! Hell a lot of folks who hated wvw went on to do it for the title. I think it's possible.