The 802.3af PoE allows up to 60W which is beneficial to all the edge clients like video cameras. With the use of midspans and PoE switches, it is possible to extend the 100m range.
I agree that 1000BaseT can be beneficial to many consumers and can simplify power & data connections for home or small offices when it comes surveillance & monitoring.
To be clear, I'm talking about interface speed to PCs here. Switched Ethernet is the norm these days, meaning that the network core can be at higher speeds than any given end system. But I'm sure that as prices for 1G Ethernet interfaces drop, 1G will become the norm in motherboards and adapter cards.