There are more variables at play here as they are still specialised items requiring specialised materials and skills. They are also less efficient, potentially increasing the demand for uranium and cost. It is likely that capital cost would reduce with volume production, but it might not reduce TCO. It would reduce capital risk in some purchase scenarios if a lower price as it means a smaller outlay prior to production, but it's still only viable if any costs due to lower efficiency of uranium use are offset by any operational cost reductions or there is sufficient power in the marketplace to offset any higher operational cost. And by marketplace, I include subsidy. Using a new design is risky so initial adoption might be challenging if no one wants to go first whereas, even given that all large plants are to some extent "one offs", there's still a lot of proven technology employed to reduce the overall risk profile. Given that, the combination of reduced capital expenditure and TCO calculations are probably going to need to be quite persuasive. I personally wouldn't want to wager whether SMRs will be successful or not. It's a potentially attractive concept, but the devil will be in the detail.