This won't happen in practice because it's incredibly impractical. It would require massive amounts of manpower and be very expensive.
55M is also just a crazy amount of visas for a country with 350M citizens. Especially given that I'd guess that a large amount of people travel to the US on a visa waive program.
PS: This rather useless comment is actually an expression of frustration. We are a population of more than 8 billion. Why are such concepts even tolerated?
Whatever contractor is working on this is probably salivating at the opportunity to refine capabilities. I still think at some point this is going to be used to field questions like "ok, show me the top 10 citizens in this area who regularly engage in X online behavior."