[hueving]

An inversion only happens when there is an incentive to do such. IP networks became much cheaper to run reliably and in a scalable fashion.

What problem does bitcoin solve for banks?

[pablovidal85]

It solves exactly the same problem, using a distributed network of peers reduces costs while increasing security and availability.

[hueving]

Is there anything that shows banks have had difficulty with the security or availability of bank-to-bank transactions?

[pablovidal85]

I don't think difficulties are involved here at all, lowering costs generally translates into higher profit, that should be enough to invest in new technology.