SOA filling the Gaps

Many large banks are IBM Mainframes users. They use mainframes for decades. They use other platforms as well, but their Core Banking systems are deployed on Mainframes. Recently leading Cloud Computing vendors such as Amazon , Microsoft and Google approached large banks in order to start migration of systems to their Public Clouds.  I looked for evidence supporting the notion that Banks are transforming from Mainframes to Public Clouds. I found no evidence. I am not the one to be blamed for not finding any significant evidence, because there is no evidence supporting the notion cited above.  Banks are using Public Clouds but... Like many other organizations, banks are using Public Clouds applications. However, they do not use it for Core Banking systems deployment. They use Public Clouds for applications which are less integrated with the Core Banking systems. If they will not use Public Clouds for Core Systems, IBM Mainframes will be used for many years. Public...