well, hopefully they change the scaling. if a non-BIS 20 hunter can hit 4000, a BiS 29 lock can prob push 8000+
edit: it's not that bad actually. for example, just looking at warrior alone, they have A LOT MORE mobility and dmg reduction in DF.
1, 30 sec intervene (charge friendly target)
2, 20 sec charge (hostile target)
3, 20 sec bloodrage (removes all snare)
4, 15 sec heroic leap (move to any location)
5, -20% dmg taken from defensive stance
6, -10% dmg taken from enrage (warpaint)
7, -20% dmg taken from vers (can easily hit 40% vers with epics)
8, storm-bolt (stun)
so it would be hard for you to aimed shot me because i can just move out of range or stun you, and even when you manage to shoot at me, i have so much dmg reduction that I will probably live anyway.
so it will be a very bursty yet also high mobility meta, people won't have much margin of error. PvP will require a lot of skill in DF because you get so many more abilities and talents than before. there won't be any MM hunter because they always struggle in high mobility meta, even right now in this bracket MM hunter isn't even tier S, DF will make their life much harder when everyone gets more stuns and mobility.
in addition, things will still change significantly in the last 40 days
conclusion: it will be fine.