If the average network speed factors in those with 1GB fiber networks, then the bulk of users fall below the average network speed. But any data figures are old - even 2014 - and the average is shifting upwards.
The real untapped dimension is how to factor in all the people who don't have their own devices yet (in developing countries) - where there is one per family or neighborhood. When you explode that number and everyone starts getting their own devices worldwide - the market for video explodes further - even from these numbers.
Worldwide Smartphone Shipments Increase 25.2% in the Third Quarter 327 Million Units.