I think this is a very silly idea that would be super destructive and net negative for the world.
The whole reason there are anti-competition laws is because many smaller companies are better for an economy than one large company.
Let me give you one small example: MediumCo and SmallCo each need 50 stenographers to get the office work done. When the two merge into MegaConHugeCo, it only needs 60 stenographers to get the office work done. "Economies of scale" are great for the giant new company, but throw 40 people into unemployment. That is bad for an economy.
Multiply that by all of the functions of a company, and you understand why the federal government and politicians put so much attention and resources into helping small and medium businesses.