If you mean, how long will it be before hard drives with a capacity of a terabyte are made ? - Its been done, ages ago. Commercial 1Tb drives have been around for yonks.... it may be a while before they are common in your average laptop from dixons though......
Terabyte drives are NOT recommended, however unavailable. Imagine filling it and then it biting the dust, you think 10gb of MP3s is a painful loss lol.
look into RAID to acheive 1TB+ capacity.
2. UK backbone links to US and EU backbone links are probably not even 1TB connections, a long while. A 612MB Asymmetric connection to the net costs about 1.2million pounds a year. But consider this.... a modern CISCO router (carrier grade) can handle 4TB/S throughput. Mind boggling.