I actually think there's an opportunity in the opposite direction: convert your SaaS apps to spreadsheets.
Instead of having to log into 10 different SaaS apps, you simply make a few menu selections from within Excel / GSheets and your data is pulled in, ready to be analyzed.
The spreadsheet becomes the UI, and the SaaS "apps" are basically databases accessed via an API.
This was my thought as I read through the comments. Email and spreadsheets are great, they’ll be around in five years. Almost nothing else is so dependable (besides having to pay taxes).
The company that makes many of the Google Sheets add-ons (https://www.ghostwrench.net/) that I use at work has made this their bread and butter. Google Sheets IS the interface to their software.
Instead of having to log into 10 different SaaS apps, you simply make a few menu selections from within Excel / GSheets and your data is pulled in, ready to be analyzed.
The spreadsheet becomes the UI, and the SaaS "apps" are basically databases accessed via an API.