There's an article in the Guardian quoting a former Barclay's executive to say that banks could lose up to half their staff (and branches) to e-banking in the next 10 years.
Automation of internet banking is one force behind this. Another is modern digital banks that have no brick branches at all.
In fact so called "FinTech" (financial technology) businesses are growing quickly.
Here's a chart from business insider:
So far American companies are dominating.