I predict a different outcome: the rate of vulns identified and fixed will be more than matched by the rate of new vulns introduced by irresponsible use of LLMs on top of brittle and unwieldy tech stacks.
The result will be an overall increase in turbulence and the normalization of steadily intensifying security crises in nearly all software systems.
The only projects that will escape this fate are those which have either been already developed from ground up with rigorous and principled, verified (or verifiable) design, or those which are rewritten to gain this.