Give it a few years and nobody will want to run software that hasn't been debugged and hardened by AIs. It's going to be much more thorough than human auditors - it already is, to some extent, and faster anyway, but I'm talking about the future. So it's going to be the latter, complete normalization of AI. You can still write the program by hand, but you'll need AI to make it trustworthy and secure enough, if only because the attackers will also be mostly AI.