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Except we won't be growing insane amounts of crops to feed them all. And I'm really not sure that what you've said is really true, unless you've got something that can back it up.

Will their population increase to replace the population of cows? A quick google suggests that before the US was settled methane from wild ruminants was around 70% of what beef in the US is now, and that number will certainly be much lower even without cattle farms. (I didn't provide that source because I don't trust it and I'm not going to do a ton of research because it's your claim, I would legitimately love to read any proper studies you have read though). Even then, that's just the US, not every country will have an effect like that. Stopping cattle farms here won't cause an increase in populations of much of anything that could cause methane production. Not to mention a lot of that land could be restored to forest in many parts of the world which is going to help with sequestration of CO2, and hopefully restore a ton of biodiversity making the environment more resilient.

I don't think we should hunt for food regardless, but that's just my opinion. I really don't see how the relatively smaller population increase is going to somehow offset the massive reductions from stopping beef farming. Especially if you consider the environmental impact (by which I mean land and water pollution) of growing all that extra feed crop.