Excel is used as a RDBMS. It is used as an analytics system. It is used as a workflow management tool. It is used as a templating system - I've even seen it used to print credit card statements with z/OS on the backend (so it is not like developers or budget are lacking). It is really easy to use, and everyone uses it. It can easily conform to the Agile method for creating dashboards and reports.

If you're concerned, perhaps write (or get someone to write) modules for it that you can import. A lot of proprietary stuff gets done in C++ modules, from investment to HR. These modules are pretty easy to break down complexity and testing, and are defacto in my industry (banking).

Excel is, simply, not going away.