The only way to know is to have a valid model, and do the math... Swanson's observation/hypothesis of linear continuation on a few data points is far from a solid model, definitely not going to be added to thermodynamics just yet! You need World-3 and much understanding of the EROEI of everything, intermittency, and so on. My readings lead me to believe that the current batch of renewable energy is heavily subsidised by many still-functioning CO2-producing activities, and a true renewable-based world looks a lot more like that street with horses than what you believe.