It was definitely a revolutionary concept. Subsequent lawsuits, e.g. with Quattro and 1-2-3, determined it wasn't IP-protectable for the most part. But VisiCalc absolutely laid out a fundamentally incredibly important application model for which the creators never made a lot of money. (And fundamentally different variants of VisiCalc never went much of anywhere.)

The same could be said of the web but this is even truer.