I think there will be a couple benefits of using agents soon. Should result in a more consistent codebase, which will make patterns easier to see and work with, and also less reinventing the wheel. Also migrations should be way faster both within and across teams, so a lot less struggling with maintaining two ways of doing something for years, which again leads to simpler and more consistent code. Finally the increased speed should lead to more serializability of feature additions, so fewer problems trying to coordinate changes happening in parallel, conflicts, redundancies, etc.

I imagine over time we'll restructure the way we work to take advantage of these opportunities and get a self-reinforcing productivity boost that makes things much simpler, though agents aren't quite capable enough for that breakthrough yet.