I believe in humane and sustainable treatment of animals and I do question what it would be like if everyone went vegetarian, wouldn’t that render all those ani

I believe in humane and sustainable treatment of animals and I do question what it would be like if everyone went vegetarian, wouldn’t that render all those animals useless so it would reduce their propagation and life? Billions of animals would have little to no use to humans-therefore they would not be farmed or bred, there would be no life for them... it doesn’t make sense, to the point it’s almost absurd to analyze.