People will only build it by hand if there is a market for it. Otherwise it'll be mostly hobby software build for learning and entertainment (opensource). Businesses don't mind factory software Although the cost of developing software is going down and will be almost free, in that case, the price is actually of taste. The best designed easy to use Interface. My guess is there will be some people, even in future, who would prefer custom handmade artisanal software written entirely by hand. Those will be probably artisanal software collectors. Maybe there will be some art galleries in future who will auction this software as art pieces to be demonstrated in museums or galleries. These will be rare events. Most commercial software will be factory made.