One way to make banks boring and predictable would be to define precisely what kind of products they are allowed to sell. This sounds like what Taleb would want, but it don't think it would be good to entirely eliminate innovation.
But if regulators would forbid any product valued by models they don't understand, it would probably be a good start.
Taleb has no problem with innovation - as long as the risk of the innovation is borne by the innovators, or investors putting their own money at risk. The problem occurs when people bet other people's money, reaping nost of the rewards when the bet pays off, and incurring little loss when the bet goes wrong.
But if regulators would forbid any product valued by models they don't understand, it would probably be a good start.