I'm not quite sure SaaS is dead but I can't see the price not being depressed by AI clones.
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.