One question/thought: what's your security like? Inevitably, people treat spreadsheets like databases for better or worse. That means they often contain lots of things that might be better stored elsewhere - sometimes PII, sometimes a proprietary formula, set of factors as inputs to a process, etc.
So, I think many spreadsheet-heavy businesses will avoid something that doesn't obviously sit inside the fortress of security they've approved. Of course, someone can just accidentally email a spreadsheet to the wrong person or store it somewhere with no security. It happens all the time, I'm under no illusion.
Point is: I would be more likely to give it a shot given a base level of confidence about the security of storing anything in these sheets.
Interested to hear your take!