I don’t know that that really answers the question properly. If you don’t have a sustainable population base, then the concept of killing and freezing the majority is moot. It won’t be the lack of food that’s the issue.
I think a proper answer would have to assume farming humans for food, over time. Would it be possible to breed in fast reproduction rates? Are we limited to only meat, or are we going to breed milk hucows? How big a population could be sustained with current reproductive speeds? Being limited to one or two babies every year from each hucow doesn’t seem like it would work out without huge herds, so wouldn’t that be the biggest limiting factor?
Then, even if we get reproduction up to speed, are we eating huveal, or letting them mature? Most livestock raised for meat tends to need to be ready for slaughter in a fairly short time, a year or two. A human that age wouldn’t give much meat at all. So upper point would it take to breed a new subspecies of human that can reach a breeding age rapidly, produce more than one baby a year, and develop muscle fast enough to be ready for slaughter in roughly the same span of time as cattle to be realistic as a long term food source.
And, since we’re all cannibals now, what portion of the hucows is going to be reserved as hucow food?
I can’t help but think that the vegans are going to be extremely pissed in this new world! 
Could be, but I’ve seen some state that cannibalism is vegan, as long as consent is present. Be interesting to see how they’d view this scenario
if we eat 1/2 of the remaining humanity each time, we can go until forever
I’d hang out near the trains in India myself. Would be like a buffet!
I’d fight like hell to get ahead! Then maybe a couple of legs and that should fill me up for awhile.
