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Try to imagine the opposite scenario. What if none of the animals is categorised as food? You won't need to worry about munching insects 3 decades later.

Well, that is if we do not stop eating animals by then. In fact, there is more urgency to move towards totally plant-based diet. Even W.H.O. has clearly stated this. Currently we are facing a daily extinction rate of about 137 species per day on an average. National Geography had said that by 2048 all the fishes from world's ocean would be drawn at the current rate of fishing and all the oceans will become dead zones.

So you are right that we won't be left with many animal species by 2050 if we continue to consume animals like we are doing today. Unfortunately, growth rate of consuming animals is increasing day by day.