The argument posited here is that Amazon has reached "escape velocity" and that the sheer amount of market share and capital and control of infrastructure they have makes it unrealistic that someone will come for Amazon. That's not an argument I've heard made before, but I do find it persuasive.

They literally control large portions of the internet with AWS, are moving into air freight, ground freight and I assume sea freight is next. They control the warehouses and they control the customer experience. They have third-party sellers and then once popular they steal their ideas and drive them out of business, because they can afford to.

The bigger Amazon gets the harder it gets for someone to overtake them.

And while you may not care yet, the natural outcome is that once they are the only game in town, they will simply raise prices. On every purchase you're winning the battle while losing the war.