The point is that the cost to replicate Google search as a whole will drop like a rock. They have brand value, which you are arguing will maintain their monopol

The point is that the cost to replicate Google search as a whole will drop like a rock. They have brand value, which you are arguing will maintain their monopoly. But I really dont think thats true. Their business model is built on serving links, which as time goes on will become more and more obsolete. The links are where the ad money comes from.