I think one specific development we might see would be an end of the SaaS micro tool era.
Possibly, but if SaaS tool providers make APIs so AI tools can consume the data, that would open up a huge ecosystem of AI 'plugins' that would be immensely valuable. I think OpenAI have something like that already.
Could be! Most SaaS tools I can think of cover some specific work flow in a way that it kinda works for 80% of the customers. Their UI is quite an intrinsic part of the offering, an API-only version of it wouldn't be as valuable. But if nobody has to put up with only getting 80% of their needs met, why would they? I'd imagine we'd have a few very general purpose systems that can indeed be glued together in a largely automated fashion. But getting the business processes into them in a meaningful way would then be the hard part, the programming.
I can encourage everyone to read good old "Domain Driven Design", there's a world of interesting problems and work out there beyond the purely technical side of things. And I think that part is a lot more difficult to automate than creating a WordPress site from a .psd.
Possibly, but if SaaS tool providers make APIs so AI tools can consume the data, that would open up a huge ecosystem of AI 'plugins' that would be immensely valuable. I think OpenAI have something like that already.