The future calculus of memory management

10GbE latency on things like netperf TCP_RR is indeed in the range of 50 microseconds, and with lower-level things one can probably do < 10 microseconds, but isn't that an unloaded latency, without all that many hops and probably measured with something less than 4096 bytes flowing in either direction? Also, can we really expect page sizes to remain 4096 bytes?