Three high-level reasons I think Leopold’s plan looks a lot less workable:
It requires major scientific breakthroughs to occur on a very short time horizon, including unknown breakthroughs that will manifest to solve problems we don’t understand or know about today.
These breakthroughs need to come in a field that has not been particularly productive or fast in the past. (Indeed, forecasters have been surprised by how slowly safety/robustness/etc. have progressed in recent years, and simultaneously surprised by the breakneck speed of capabilities.)
It requires extremely precise and correct behavior by a giant government bureaucracy that includes many staff who won’t be the best and brightest in the field—inevitably, many technical and nontechnical people in the bureaucracy will have wrong beliefs about AGI and about alignment.
The “extremely precise and correct behavior” part means that we’re effectively hoping to be handed an excellent bureaucracy that will rapidly and competently solve a thirty-digit combination lock requiring the invention of multiple new fields and the solving of a variety of thorny and poorly-understood technical problems—all in a handful of years.
(It also requires that various empirical predictions all pan out. E.g., Leopold could do everything right and get the USG fully on board and get the USG doing literally everything right by his lights—and then the plan ends up destroying the world rather than saving it because it turned out ASI was a lot more compute-efficient to train than he expected, resulting in the USG being unable to monopolize the tech and unable to achieve a sufficiently long lead time.)
My proposal doesn’t require qualitatively that kind of success. It requires governments to coordinate on banning things. Plausibly, it requires governments to overreact to a weird, scary, and publicly controversial new tech to some degree, since it’s unlikely that governments will exactly hit the target we want. This is not a particularly weird ask; governments ban things (and coordinate or copy-paste each other’s laws) all the time, in far less dangerous and fraught areas than AGI. This is “trying to get the international order to lean hard in a particular direction on a yes-or-no question where there’s already a lot of energy behind choosing ‘no’”, not “solving a long list of hard science and engineering problems in a matter of months and weeks and getting a bureaucracy to output the correct long string of digits to nail down all the correct technical solutions and all the correct processes to find those solutions”.
The CCP’s current appetite for AGI seems remarkably small, and I expect them to be more worried that an AGI race would leave them in the dust (and/or put their regime at risk, and/or put their lives at risk), than excited about the opportunity such a race provides. Governments around the world currently, to the best of my knowledge, are nowhere near the cutting edge in ML. From my perspective, Leopold is imagining a future problem into being (“all of this changes”) and then trying to find a galaxy-brained incredibly complex and assumption-laden way to wriggle out of this imagined future dilemma, when the far easier and less risky path would be to not have the world powers race in the first place, have them recognize that this technology is lethally dangerous (something the USG chain of command, at least, would need to fully internalize on Leopold’s plan too), and have them block private labs from sending us over the precipice (again, something Leopold assumes will happen) while not choosing to take on the risk of destroying themselves (nor permitting other world powers to unilaterally impose that risk).
Leopold’s scenario requires that the USG come to deeply understand all the perils and details of AGI and ASI (since they otherwise don’t have a hope of building and aligning a superintelligence), but then needs to choose to gamble its hegemony, its very existence, and the lives of all its citizens on a half-baked mad science initiative, when it could simply work with its allies to block the tech’s development and maintain the status quo at minimal risk.
Success in this scenario requires a weird combination of USG prescience with self-destructiveness: enough foresight to see what’s coming, but paired with a weird compulsion to race to build the very thing that puts its existence at risk, when it would potentially be vastly easier to spearhead an international alliance to prohibit this technology.