Yeah I think a few things are going to bite some people in the ass. Odoo, for example, is "open source" until you need "enterprise" things. Well, it turns out you can point a robot at it and just add those things on your own now. Bonus for releasing your fork under the same license as the community edition... Strange times.
Maybe hard to see "Workday" being replaced but I also never thought AI could one-shot all the stuff it does today.
Especially because you end up using half the features, building integrations, and working around all the limitations in off the shelf software - the cost benefit to just clone and get exactly what you need is hard to deny.