Except it isn't a fact at all; it's a silly assumption -- a lie perpetuated by who-knows-who. There already is a monetary incentive for miners to make smaller blocks, in that MPEx customers will not buy their newly minted coins produced on a counterfeit "larger blocks" chain. If the miners want to stay in business, they will keep doing as we say. Don't get me wrong, the miners secure the network; we couldn't get by without them. There will always be a chain mined by a lot of hashing power, but the miners don't get to decide which chain that is. They will go wherever the profit is, and that is determined by demand for coins.

P.S. this isn't my argument, but since you are blind to things written by billionaires, I took the liberty of paraphrasing it for you.