The population growth problem should be somewhat addressed by healthspan extension. A big reason as to why people aren’t having kids now is that they lack the resources—be it housing, money, or time. If we could extend the average healthspan by a few decades, then older people who have spent enough time working to accumulate those resources, but are too old to raise children, should now be able have kids. Moreover, it means that people who are already have many kids but have just become too old will also be able to have more. For those reasons, I don’t think a future birth limit of 30 billion is particularly reasonable.
However, I don’t think it will make a difference, at least for addressing AI. Once computing reaches a certain level of advancement, it will simply be unfeasible for something the size of a human brain, no matter how enhanced, to compete with a superintelligence running on a supercomputer the size of a basketball court. And that level of computing/AI advancement will almost certainly be achieved before the discussed genetic enhancement will ever bear fruit, probably even before it’s made legal. Moreover, it’s doubtful we’ll see any significant healthspan extensions particularly long before achieving ASI, so that makes it even less relevant, although I don’t think any of these concerns were particularly significant in the first place as it also seems like we’ll see ASI long before global population decline.
The problem with these cloze cards is that you tend to link the shape to the information rather than the words themselves. After a few goes you’ll basically stop reading the words entirely. It’s not very effective for recalling the facts irl, since usually you’ll be trying to recall the answer to a specific question (prompt), not fill in the blanks. I find that the things the OP talks about in the above guide are much better for actually recalling info when it counts.
As an aside, the philosophy of impulsive deletion/suspension from your main comment seems like a promising idea. I typically take the opposite approach and don’t even suspend leeches, with that being exclusively for useless or obviously-defined words. I might try it out if I go about learning another language though, it definitely has potential (though it also seems far more suited for high-immersion learners which isn’t something I’m good at).