I wonder if the movement to zero transaction fees will facilitate the development and greater adoption of software written to implement passive investment strat

I wonder if the movement to zero transaction fees will facilitate the development and greater adoption of software written to implement passive investment strategies like indexing. Fees for funds that do passive strategies like indexing are already incredibly low, but there's no reason they can't be zero. It ought to be pretty straightforward to implement this with some sanely written software connecting to your brokerage of choice. You may lose out on revenue streams like securities lending, but it's probably not that much anyway. Anyone have any experience with this?