This is how the rest of the world works -- I run an import/export business and have to manage logistics. It doesn't matter what industry, it could be crude oil or widgets from China at half a penny a piece. It's my job as CIO to choose an implementation.
I'm going to choose SAP or Dynamics (or one of the handful of other ERP's with name recognition) on DB2 or Oracle. I'm going to store my data on EMC dual array filers for HA and pay the tax. Why? Because if I choose node.js and MongoDB to run my 3 warehouses and the system goes down, I'm getting voted out next board meeting. If my SAP R/3 on IBM hardware goes down, they'll do the dance and at least fly some people out to retain their image keeping your job effectively safe.
Banks aren't going to move over from z/OS anytime soon. I don't want my dialysis machine to be running on Riak.