I think that if we achieve a system that is 80 or 90% true A.G.I. it will be enough to completely change the world. A slightly quirky and dysfunctional genius A.I. that is controllable will be all we need for incredible life changing things to happen and will happen much sooner than 100% true A.G.I. The last few percent may take decades but the “almost” A.G.I. will happen very soon, like in less than 5 years.