' Networks will need to support 58% compound annual growth rates in bandwidth on average, the IEEE claims, driven by simultaneous increases in users, access methodologies, access rates and services such as video on demand and social media. Networks would need to support capacity requirements of 1 terabit per second in 2015 and 10 terabit per second by 2020 if current trends continue, the organization says."
Just looking at the current rate of growth and extending it out indefinitely is clearly absurd. Exponential growth has to run into physical, or financial, limits sooner or later. Sooner in this case, I think.
Anyway, where I am, there has been no increase in speed for the last 10 years. In fact it's gotten worse, as more and more people hook up and try to stream video on their phones, pads, etc., etc., but the upstream capacity is still the same and the phone company just shrugs knowing we have no choice. So if I applied the same naive style of prediction, I'd say we are going to have 1.8 MB/sec forever. (Which may be true, unless fibre is activated in my lifetime.)