I'm tired of hearing all these suggested changes from misguided players who got boogered by some condi build, so they decide to come here and ask that "Weakness should reduce condi damage" or "toughness should reduce condi damage" or "rework the entire condi mechanic and make every player relearn how to play this game".
You want more ability to resist conditions. OK. Here's my suggestion, and here's how you would do it correctly.
Make another item slot in PvP similar to amulet, but here's what this slot does:
it allows you to choose a resistance to a specific type of damage. Lets say they open up a "ring slot" in SPvP. Here's examples of how this would work:
Ring EX 1: Reduce the duration of Cripple, Chill, and Immob by 25%.
Ring EX 2: Reduce the duration of damaging conditions by 25%.
Ring EX 3: Reduce the damage of incoming conditions by 25%.
Ring EX 4: Reduce your chance to be critically hit by 15%.
Ring EX 5: Reduce the duration of daze/stun effects against you by 33%.
Ring EX 6: Increase the duration of Boon effects on yourself by 20%.
Ring EX 7: Increase the healing done to your character by 15%.
this would allow you to further tweak a build to push a certain resistance. for example, if you're a thief, probably want to reduce condition damage taken. If you want this slot to be more unique, it could look like this:
Ring EX 1: Cripple cannot reduce you below 100% movement speed. (but will reduce you from 125% to 100% if you have a move speed buff for example)
Ring EX 2: Chill no longer slows your movement speed.
Ring EX 3: Chill no longer slows the cooldown of your abilities.
Ring EX 4: Poison no longer reduces your healing taken.
Ring EX 5: You now ignore damaging conditions if they have less than two applications. (1-2 burns deal 0 damage, but full damage on 3+)
Ring EX 6: You now ignore the first stack of damaging conditions (1 burn deals 0 damage, 2 burns deal the damage of 1 burn, 3 burns deal the damage of 2 burns..)
Ring EX 7: Burn effects now deal 33% less damage to you.
Ring EX 8: Bleed effects last 50% of their normal duration against you.
also, it could be a give and take mechanic, which would look like this:
Ring EX 1: Increases your movement speed by 25%, but Cripple and Chill have increased effects (reducing your speed as if you had 100% movement speed)
Ring EX 2: Poison no longer reduces your healing taken, but deals 15% increased damage to you.
Ring EX 3: Burn effects now deal 33% less damage to you, but duration of burns on you are increased by 33% (so, the same damage, but spread over a longer duration)
Ring EX 3: Damaging conditions deal 20% less damage to you, but your movement speed is slowed when you have more than 4 applications of a single damaging condition.
Ring EX 4: You take 25% less damage from critical hits, but deal 33% less damage with critical hits (making your criticals deal 100% damage if you have no ferocity, basically removing the crit mechanic unless you have ferocity)
Ring EX 5: You are immune to Weakness, but your power damage is reduced by 10%.
Ring EX 6: You are immune to Chill, but your movement speed is reduced to 90%, (so with swiftness, your movement speed would be capped at 123%, instead of 133%).
Ring EX 7: Your attacks still land with Blind, but Blind reduces your damage done by 33% while active, and is not removed until the duration wears off. (or is cleansed)
Ring EX 8: Attacks against you deal damage as if the target has 8 Might. (so if they have more than 8 Might, its a damage reduction, but if less than 8 might, a damage increase)
these are just examples obviously, but it would add additional ways to "counter meta" without huge sweeping mechanic changes to the game. in addition, it would actually allow you to spec into reducing a specific type of damage, whether it be power or condition, or reduce the effects of certain conditions.