Society-wide collapse?

At the back of my mind is a worry.  

We depend increasingly on the internet. If that was hacked or to collapse we would be in real trouble. 

Many in the West increasingly pay by card rather than cash. Many of our bills are paid by bank transfer, airlines take bookings over the internet. Probably our energy, water and sewers depend on the net. Most communication is by email.  Banking depends increasingly on the internet. Financial trades depend on the internet.

And so it goes on.

It bothers me that all this could come tumbling down.

Now, humans are resourceful and given time we would find a way of managing, but this would be a shock.