We, humans, are preconditioned to be linear in our extrapolation (as opposed to exponential) thanks to our hunter ancestors (and FPS games!). It is very clear that the rate of advancement of Large Language Models is super-linear, if not exponential.
Hence, I indeed predict that keyword search will be completely supplanted in the next 5 years as a mechanism for search.
Of course we will still need to do lookups for ISBNs and generic ids, but that isn't keyword search, that is index lookup functionality.
Case in point: take a look at Meta Research's Contriever model (https://github.com/facebookresearch/contriever), which already matches keyword techniques in efficacy without any supervision.
This is only the beginning, come build the future with us, we see it very clearly :)