One could certainly write such a program using a commercial spreadsheet. Unfortunately, even mature spreadsheets have undocumented numeric errors that arise from time to time. And it almost certainly does not make business sense to use all the extra safety features provided by an Ada compiler for a commercial product that will be on the shelf less than 18 months. The business case that applies to military systems is the lifecycle argument. Although sometimes difficult to rigorously quantify, the software maintenance advantages of Ada are not seriously disputed.
Programming languages matter when considering software maintenance.
Military software is not the same as consumer software. Ada was designed to build software to military specifications. Where reliability counts and where software engineering considerations factor into project management, Ada will continue to thrive. We will not win wars through superior word processing. Conclusion Language selection should be part of a rational software engineering process.