I like the idea of simply reducing the cost. They're a good unit as-is, they're just expensive for their fragility. Being fragile is nothing new to us... but we're not used to paying a premium for it. The cost is the only thing that really needs to be looked at.
Now, if you wanted to offer a new option, where they could take Pistols & CCW's, and throw Scourges into a FA slot, that's fine and dandy by me... we could go for a nice Kabalite FA.
Another thing, though - the Sybarite in a Scourge Squad is... well.... you know how they are. That model is 99/100 times left at home, or has been chopped up for bitz right out of the box. Sure, you can give him a Terrorfex... but if you've gone and let your Scourges get within 12" of something (this is assuming it's used as a defensive measure) then you've gone a bit wacky with your Scourges. Nothing wrong with running up and pinning someone (after letting loose with 16 Cannon shots).
However, I think it's an expensive upgrade with very little use. If he had some options that would benefit the squad (such as allowing him to buy an advanced targetter that allowed HW's to be fired at half range on the move, or perhaps give them stable platform as long as they move 6" or less that turn, etc) then that'd be worth it. Now I've advocated against the "move and fire HW" a lot with scourges... I don't think it's ability that should just be given to them, but as a wargear piece for the Sybarite it's not too bad. The wings are about relocation, not total mobility.... yes, it costs too much for this ability, and the points should drop. If Scourges did cost 12 each with 15 per Weapon, you could get 5 Scourges with 4 weapons for 120 points. About the price of a Ravager (similar, at least) for an extra Lance, and an easily hide-able squad.
Remember... if there's a unit that you'd take the max of every game because it's so effective... the unit is probably overpowered. Mmm... the good ol' days of the 3rd ed Biovore.... they were on my lists before my HQ was half the time.... Man they were broken. But.
In short, I say decrease the points, and making the Syb more useful with a nice piece of Wargear or two would be very nice. Perhaps offer a FA slot with Pistols and CCW's (here the Syb could really shine).
Khira'lyth