I think it's safe to assume that even though YC is dedicated to empowering entrepreneurs, in reality it's only internet entrepreneurs that get most (if not all) of the attention.
Many web startups are like "throw-away injection" devices, built for the sole purpose of commercialising and popularising that particular technology. If it is an excellent product, that contributes by adding value, and therefore imparts meaning to the user, than by all means it is OK to build such a thing to flip it.
But what about the OTHER entrepreneurs, startup guys/girls that don't just want to start web startups, but any kind of company? Web startups are such a small minority of of the entrepreneurial category. Whether 2000 or not, shouldn't this message seem relevant even today? Is there nothing sacred, nothing timeless, nothing that can transcend ourselves?
The ecosystem needs a few big companies with billions of capital and global reach, but there's nothing wrong with building up a good small idea and selling it off after a year or two to be integrated into something larger.
I agree that Built to Last not all companies, for sure. Collins outlined that in his article. But a world with 100 new HPs every year? It will never happen. It would be too good to be true. You don't get much enlightened leadership anymore. It is a rare thing, unfortunately.
The article's purpose was not to say that Built to Flip is wrong, or that Built to Last was right. It was to educate us to build something that works, but also to inspire us to build something greater than ourselves.
I suppose most ideas require more than a few months to create real value.