Err, no. The SATA 3.0 spec is 6.0 Gb/s. Most NIC's might run 1Gb/s locally, but once you hit the WAN you're probably talking about 10 or 100Mbit.
Network storage has always been slower than local, and until we get 10Gb to the home, will continue to be so.
Hard drives can't saturate SATA. And many millions of people already have gigabit service. That's roughly as fast as most hard drives.
For most users, their network speed is way way less than multi-gigabit. May or may not change soon.
I guess I should have just said 'gigabit', which is standard Ethernet speed and is roughly on par with hard drives. The point is that the network is plenty fast. Backbone and edge both. The only problem is a few isps.