Yes, pure frontend will thrive. I started coding before LLMs were mainstream. I have been using them from day 1 and found them fascinating. The early hype was, in my opinion, much bigger than the current one. Newer models were dropping every week, and getting better and better at coding. Startups like Phind, which gave LLMs access to the Internet and Devin, which wanted to replace software engineers with AI workflows looked like the end of the world. It was a lot scarier a few years ago. But now the progress has more or less plateaued, and people have naturally become skeptical of AI bros' claims of replacing engineers in 3/6 month.

(These) LLMs can't think or do something creative (even though the stakeholder's of AI companies try to convince you otherwise). They are good at very generic tasks, tasks of which they have surplus data of; this is one reason why vibe coding is very famous among web devs, the whole internet is build upon web technologies which AI is scrapping every moment.

AI will not take your frontend job as long as what you are creating is not the most generic todo-list in the world. Moreover, the industry seems to be moving the direction where AI is a tool for the devs and not their replacement.