We have several decades of empirical data to suggest this. A regime that has other basis of considerations can of course do what they want.
https://en.wikipedia.org/wiki/BN-1200_reactor
In 2015, after several minor delays, problems at the recently completed BN-800 indicated a redesign was needed. Construction of the BN-1200 was put on "indefinite hold", and Rosenergoatom stated that no decision to continue would be made before 2019. In January 2022, Rosatom announced that a pilot BN-1200M would be built by 2035.
The BN-800 reactor connected to the grid in 2015. That's a gap of 20 years between building more BN-series reactors.
Meanwhile Russia has completed 6 conventional pressurized water reactors in the last 5 years:
https://pris.iaea.org/PRIS/CountryStatistics/CountryDetails....
I think it's fair to say that breeders are still too expensive and complicated to compete with conventional reactors. The money saved on fuel is just not enough to justify the extra complications considering how inexpensive uranium remains.
I frankly think that these considerations are exaggerated in countries which already have nuclear bombs (like USA, Russia, China, France, UK, India, Pakistan, Israel,..). Japan does not have a nuclear arsenal, but, frankly, a normal nuclear power plant can also produce plutonium, maybe only somehow more visibly, so Japan might have built nuclear warheads on a year or so, had they decided to do so (and violate their Constitution).
But sure lets kill a great program to build next generation reactors and solve the 'nuclear waste' 'problem' by preventing that.
Just another one of the many ways the public opposition to nuclear has prevented all the progress.
Or ever. Breeder reactors aren't a new idea. The concept has been around half a century, and they were put in commercial use 35 years ago. Thus far with enormous cost overruns and spectacularly bad uptime.
It's good that we research these things, but we shouldn't base our energy infrastructure on things which aren't commercially available for good reasons.
It's sad for everyone that energy infrastructure turned out to be a really, really hard problem, but wishful thinking doesn't make it go away.