The internet has changed things. It's changed things very rapidly and by things I mean all things including people. Knowledge, prior to the internet, was solid and dependable. Generally things were known and remained static. Even when changes in knowledge happened it too a long time to disseminate the new approach, idea, information so changes were slow.
Now 'knowledge' does exist as before - like a mountain range subject to small and gradual changes but essentially fixed - but as a flower bed with weeds sprouting every few days and a constant cycle of growth and change.
Knowing things became less important compared to knowing how to find out things. Why memorise the world's highest mountains when the information is stored and accessible within seconds on any smartphone? I need not learn something if I can easily and immediately collaborate with someone who already knows it. This was we both can get a deeper and more detailed knowledge of our own respective areas rather than duplicating a more shallow knowledge on each other's areas.
It seems obvious that a new theory of learning is necessary as the nature of knowledge is so changed.
Previously my knowledge was mine. I accrued and collected it. In connectivism the network of people and technology enables all of us to share a much greater and deeper collection of knowledge than the sum of the knowledge we would have amassed under the old way.