If you have both procs up anyway, I don't really see what the problem is - you could still dualcast Verstone into Veraero, and Verfire into Verthunder, each of which would lower the risk of refreshing a proc at a DPS loss anyway.
That's the problem though - they're part of the rotation. As movement tools, they should be used as-needed, not tapped on-cooldown for the bonus oGCD damage, especially in small arenas or other cases where you have incentive to avoid moving. You're even advocating to nerf Displacement's primary purpose as a distancing tool in favor of keeping it in the rotation for damage you yourself maintain is low.
Besides, I've seen Corps-a-Corps kill before - using it on cooldown can lead to pulling yourself in right before an AoE if poorly timed...
(Mansion was the one who suggested the distance reduction. On the other hand though, I wouldn't be entirely against reducing the distance it can toss you... if you could use it from a further distance as well, and/or it maybe had a Heavy effect attached so it takes as long for overworld enemies to reach you.)
I like the idea of Displacement containing an aggro dump, but I maintain that the damage from both movement tools should be shifted onto our melee combo.