alt Hacker NewsLibreOffice vs Office 365/Google Drive is probably the more relevant comparison.
I won’t comment on market share, but even if theoretically QGIS totally displaced ArcGIS Pro/ArcMap/ArcGIS on the desktop, the arena of competition has shifted to ArcGIS Online and its competitors. And once you’re in ArcGIS Online, Pro becomes the convenient choice for desktop editing.
LibreOffice could be miles better than Office on desktop, but the competition is lost because Office on desktop is just an accessory for Office 365 (which competes with Google Docs/Drive).
Disclosure: I work at Esri.
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That's an insightful nuance. I've seen you just create divisions in organisations because while it is a really fully featured desktop application, it implies a way of working that doesn't play well with the cloud, which creates barriers between experimenting and production.
I don't think the comparison is quite apt, because while LibreOffice has no support for collaborative workflows (short of error-prone shared drives), QGIS can connect to quite a few geospatial databases, with third parties offering plugins for their own cloud platforms.
It would be nice to have better support for browser-based sharing and editing, but the desktop-based parts are there already.