I've got blues in a ~3 acre pond, they've been there for about 7 years and are reproducing. Pretty fair populations of BG,RES,GSF for forage. The LMB population has definitely suffered-I think the larger BCs, up to about 25lbs, are fairly heavily feeding on LMB in the ~12" range. The BCs seem to have altered BG behavior--I frequently see schools of BG in the middle of the pond, feeding on the surface almost like trout. I think they're afraid to get close to shore where the BCs hang out. I never see this behavior in another pond a couple hundred yards away that doesn't have BCs.
The BCs seem much more piscivorous than CC. I frequently catch them in the 2-3# range on crankbaits in shallow water, sometimes 3 or 4 an evening.
I would think, over time, that BCs could really help with your carp issues.