Popular opinion is bitcoin is too big to fail or too big to become irrelevant, well, plenty of bigger enterprises have failed or are now irrelevant, myspace is a good example.
Concerns expressed by Gavin are shared amongst many of us for at least a couple years now, I'm of the opinion we've already passed the no return line some time ago, as people cannot build on the bitcoin network and many have been pushed out and had to build their own blockchains or build in some other blockchain, this is reflected on the current low value and the occasional pump without the possibility for growth.
Bad business models fail. Good businesses adapt, others will go bankrupt. Why didn't we change the consensus rules to encourage the Satoshi Dice model? Why should we change them for the likes of Coinbase and Bitpay? They are here to make money, and may be willing to do so at the cost of long term network health. What matters are p2p users. In the long term, sustainable business models will survive.
Yes, bad business models fails, that's why we are concerned about the current state of the bitcoin network.
"Why should we change them for the likes of Coinbase and Bitpay?"
What are you talking about? Off-chain transactions is their business, less transactions on-chain is better for them, they can even settle between them using mySQL.