Gavin's quote is talking about "pressure" from the amount of transactions these businesses will put on the existing limits of the block chain. He's not talking about direct pressure from the businesses...
Using the chain != Petitioning the Bitcoin foundation
I understand from technical point of view, the transaction function is very important, but there are other aspects more important than transaction function. Anykind of alt-coin can provide transaction function, litecoin even designed to process the transaction faster than bitcoin. Crypto currency's value is not only decided by its transaction function
Gold is not good at providing fast and large transaction, but that doesn't stop it from being the monetary base of world's bank for centuries, because it has superior consistency and stability, no one on the planet can change the character of gold, no matter how big power they have