A recurring theme of the AI rollout era is ppl thinking that AIs render a technology or process obsolete.
CMS's like wordpress don't solve the problem of allowing non-technical people to manage a website. They solve the problem of allowing you to separate the content of your website from the logic of it.
Now of course these tools will change to be used by Agents, but honestly probably less than you'd think. AIs are very good at interacting with software like humans, so the transition will be pretty small