I think it would be much less dramatic than that if you mean human level abilities by AGI. Initially you might be able to replace the odd human by a robot equivalent probably costing more to begin with. To scale to replace everyone levels would take years and life would probably go on as normal for quite a while. Down the line assuming lots of ASI robots, if you wanted them to farm or build you a house say you'd still need land, materials, compute and energy which will not be unlimited.