SEO will last as long as SE results are generated by algorithm/programatic means. Both on-page and off-page optimization strategies will be developed to try to game the new algorithms.
If I write an article on ‘loading dice’ and dom writes a very similar, but unique article, the SEs need to make a decision as to which is better. What ever Dom and I do/try, one will rank better. What the SEO strategies, tactics will be, whether on page or offpage moves make the difference, etc is unclear and pretty much unpredictable.
Change doesn’t mean disappearance.