The link in sferrin's earlier post said Zetaflops by 2027, so maybe before 2040.
First MegaFLOP computer - IBM 7030 1961
First GigaFLOP computer - Cray 2 1985
Gap: 24 years
First TeraFLOP computer - ASCI Red 1997
Gap:12 years
First PetaFLOP computer - Roadrunner 2008
Gap: 11 years
First ExaFLOP computer - Frontier 2022
Gap: 14 years
Based on that, the next step, ZetaFLOP, would be *about* 12 years from the last, or 2034-ish. Getting there by 2027 would mean it only took 5 years, a substantial acceleration from the existing trend.