Even if you show them that your IT modernization has the potential to save the company millions of dollars a year, they will decline your proposal because "the current system works/no need to upgrade and risk issues".
The literal only way to get banking C-level execs to modernize their 70s era mainframe stacks is regulatory action. Only with the threat of massive government-levied fines or closure of business, they will go ahead with change.
That doesn't help against clueless execs who live 20 years or more in the past. Japan's cybersecurity minister literally admitted to never ever having used a computer in his life (https://www.theguardian.com/world/2018/nov/15/japan-cyber-se...).
Even if you show them that your IT modernization has the potential to save the company millions of dollars a year, they will decline your proposal because "the current system works/no need to upgrade and risk issues".
The literal only way to get banking C-level execs to modernize their 70s era mainframe stacks is regulatory action. Only with the threat of massive government-levied fines or closure of business, they will go ahead with change.