Yes it will, but you are not seeing where a big rogue dps comes from= sneak attack.
Rogues have always gone for the most attacks per min to maximize sneak attack damage. Now if a repeater can fire 50% to 100% more shots over the course of a minute that is an enormous difference in dps between the 2.
If the rogue has even a 70 base damage a shot with a great crossbow, then every +1 crit mutli adds only 70 extra damage on a crit (85 with seeker 15).
BUT!!!!!
A equal level rogue with 30d6 sneak attack (only 1d6 less then great crossbow) with do an extra 105 damage every hit. If that rogue has 30% more attacks per minute that pulls him massively ahead. So yes, I still believe on paper let alone in game great crossbows are not viable yet vs repeaters.
Suggestions=
Double attack % on great crossbows
a bit off topic suggestion=
This tree could also use
Sniper Shot: Ranged Attack: Performs a ranged attack with +2[W], a +4 bonus to-hit, +2 to critical threat range, and +2 to Critical Damage Multiplier. On Damage: The target will become momentarily confused and rendered vulnerable to sneak attacks for four seconds as if affected by the bluff skill. (Cooldown 6 seconds)
That is from deepwood sniper tree and honestly it even outclasses the assassin removal of sneak attack penalty.