While inequality has gone up, so has the quality of life for the average person. The average person might be getting a lower percentage of the pie, but the pie is growing so you're still getting more pie after everything is accounted for. I think there still will be megacorps in the future, but in a post scarcity society there will be no reason not to give everyone a utopian standard of living. It would cost nothing in comparison to the infinite resources of space.