What do you think is the long term prospects of frontend development? I have come to terms with continuous learning in frontend but I can't help but feel that

What do you think is the long term prospects of frontend development? I have come to terms with continuous learning in frontend but I can't help but feel that I am standing on unstable ground. That one day, all the knowledge that I have accumulated would become irrelevant. I have come to the point that I am learning backend using Python just to have a fallback.