There is a huge possibility of younger or new generations adopting cryptocurrency investments compared to them getting interests on farming and food related sectors. What do you think? Does it have a good or bad effects on our economy?
Due to advance technology in this era food security will not be an issue, because they are several tech concerning farming and new innovation of farming system to mitigate food scarcity, security of food will be thing of a past. In this technology driven age food security is sure for the younger generation.
Agriculture will not be abandoned by any generation to come because food, shelter and clothing is our basic needs and we get them from agriculture. It is only when the interior villages are turned to cities and no more land to farm, before the young generation will find it difficult to farm. There are people who have passion for agriculture to the extend that they study it in school. No matter that I have bitcoin investment, if I see a big land to farm, I will do it and pay labourers to work on my farmland when it is needed. Essential commodities will not be lacked in any country.
In your scenario you did not take into account the process of "self-regulation" - with uncontrolled growth of cities and absorption of fertile land, there will be a sharp reduction in food and rising prices for them, which will lead to a natural decline in population, and the emptying of cities, and therefore - a drop in demand for "cities". Mankind is certainly not "clever", but mankind will not be able to leave itself without critical resources, because without food, man is not able not only to build cities, but also trivially just to support the process of life.
The only thing that I can assume is the departure from private agriculture, and the transition to "mega-farms", this can happen, or rather - this process is already happening