This article emphasizes the positive without taking a close look at the risks. Molten Salt reactors have been seriously problematic so far because the corrosion and wear of pipes and valves has exceeded predictions. The assumption here is that we now understand all the factors involved and can control them, but even with that it is not clear that the costs of doing so will balance out over the long term. Having to make super high tech coated pipes and valves for everything and replace them frequently adds up to significant overhead while the reactors are only ever that: just reactors.
