The answer to this question can be Yes and No. Frameworks both in CSS and JavaScript come and go so there might be a new trend in a few years henceforth and React/Vue/Angular might not be used again in that case. But the point is HTML/CSS and JavaScript are here for quite a long time (maybe forever xD) so you better understand them well and if you do you will have no problem adapting any new framework since they are just a thin layer on CSS or JavaScript to make your work a bit easier.
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The answer to this question can be Yes and No. Frameworks both in CSS and JavaScript come and go so there might be a new trend in a few years henceforth and React/Vue/Angular might not be used again in that case. But the point is HTML/CSS and JavaScript are here for quite a long time (maybe forever xD) so you better understand them well and if you do you will have no problem adapting any new framework since they are just a thin layer on CSS or JavaScript to make your work a bit easier.