I posed that question of the reality of that infinite growth to my econ professor back in the day, and their response was that technological advancements have allowed it in the past and likely will through the future. The plan appears to be to throw money at problems as they come up and coast into the sunset on the current economic system without a serious long-term plan for when things break down.

Unfortunately as most people here are probably aware, throwing money at a problem doesn't always result in a viable solution. As more and more of the low hanging fruit of technological advancement gets picked we may be in for some interesting times.