I love building things, especially new things. I've started to see over the years that while I've built many things, I've failed just as much to maintain them.
I think there may be a paradox underlying his point: while we need to build things, we also need to maintain things. If I have limited resources (e.g., time, money, land, materials, etc.), then if I choose to build something, I may be choosing to abandon (not maintain) something, or even to destroy that thing. I think this applies to businesses, apps, bridges, skyscrapers, and even relationships. If I start something new, it often replaces the old.
I believe we may struggle with this, because, while we crave new things, we get emotionally attached to old things. We get attached to the way we're able to see the SF Bay from our house and don't want anything blocking our view. We get attached to our expertise and comfort at coding in a specific language and don't want to learn yet another new language. We get attached to the way we've made cars day after day, year after year, and also to the juicy profits and lives that it has given us.
Also, I think a lot of business models rely more on the maintaining of things than they do the building of things (unless you consider maintaining some sort of (re)building, but I don't). Facebook built a platform and for the most part, while adding users, seems to maintain it and want to prevent others from taking their users. Someone who builds a nuclear power plant will probably spend a lot of money building it and therefore wants to "milk the asset" for as much as they can. Even the construction firm who builds the power plant probably has methods that they've practiced over the years, and wants to leverage the learning of those methods more so than learn new ones.
I still agree that we need to build new things, I just believe there are strong financial and emotional reasons for why we maintain old things.