Hear me out. Nature's vigil was a little over powered when coupled with incarnation, I agree. a change was needed in our burst, but we need something to sustain our DPS. Overall NV will likely still outdo the other 2 talents just because it will be better utility.
1) 10% less dmg for a 1.5 min decrease in time, thus increasing the amount of times it'll be cast in a fight.
2) The duration is still 30 seconds. Therefore on first cast, we get a 30 second duration, on the second another 30 seconds, on the third, another 30. with the previous you'd only get 60 second worth of NV.
Thus the new change overall gave us a more sustained damage cd. We lose 10% dmg and healing. For what? Take into account a 6 minute fight. Nature's vigil being what it currently is versus PTR, You'd get 3 casts. Now you get 6, equaling an increased minute of 10% damage and healing.
So in my opinion, Nature's vigil will actually be better, and is looking to still be the choice come 5.2 in ToT.
Note: This is all opinion based, so don't take it so serious. Just tell me what you think.