I didn't say there aren't any. I said that the markets aren't dominated by them, i.e. there is obviously such a thing as a large company declining, and it is obviously a common enough thing for there to not to be thousands of gigantic century-old companies among us.

It's plainly absurd to say "a company is big therefore it will grow." In my reading of the original comment I ignored the caveat of the 5-10 year timeframe. It's true that a gigantic company can almost definitely decline for 5-10 years without disappearing. It's not true that that means it will grow for those 5-10 years instead.