said by tmc8080:not necessarily.. it is common for local networks to use faster networking equipment to route slower connections.. 100 megabit streams running on 1gigabit networks and gigabit streams running on 10 gigE Once the gigabit threshold is breeched, you need the next step which is 10gigE wan ports. this is most common in other data cabling standards.. SATA, HDMI, USB, etc..
I'm not denying that, but 10Gb for even somewhat power users will still be quite a niche even a few years from now. 1Gb though will become the norm.