You have a data center standardized on 10GE connections. With, say, Nexus 7000s in the core, Nexus 5000s at the aggregation, and some fabric extenders for the edge to the servers (I use Cisco gear as examples because this is what's in my specific lab). There are some ACE 4710 load balancers hanging off your Nexus 5000s, but these only have 1GE interfaces. All of your switch connections are 10GE, needed for the massive east-west (VM-to-VM) traffic in modern virtualized data centers.
Do the load balancers not become a bottleneck in certain traffic conditions? I can see how some local east-west traffic does not need to even reach the load balancer, but there are other situations where you need to traverse the core, and possibly even a data center interconnect.
Basically, I know the load balancers are used in client-server (north-south) traffic, and things like HTTP GET do not need 10GE, but are there situations in which your 1GE load balancer can get in the way of an otherwise all-10GE traffic path and cause problems for things like vMotion (for example)?