Like so many other aspects of Mormonism, eternal progression was one of those things that sounded great on the surface but got weird enough fast enough that I had to stop thinking about it. I've already brought up the conundrum of eternal learning in another post. We don't know how we're going to learn everything in the Universe, but we have faith that we will. And after we've become all-knowing beings, just like God, we'll be fully progressed and ready to build our own perfect universes, right? Who knows?
The real problem here is that once we've become like God, who is perfect (complete) in all things, what progression is left to be had?
The idea that had been conveyed to me was that because saving human beings is God's work and glory, the more people get saved the more glory God gets. So, in a sense, God, despite his perfection-completion, is somehow becoming ever more glorious by making us, his children, like him, and when we, in our perfect, completed state, make and populate our own worlds, and save the human inhabitants of those worlds, we will be not just adding glory to our own perfect selves but also to God's glory because we wouldn't be saving anyone had he not saved us first, so really everyone we saved was saved by God. Then when the humans we save become like us (and God) and start saving their own human children the glory still goes straight back to God to glorify him all the more.
In other words, eternal progression is equivalent to the endless perpetuation of God's salvation scheme. The more people you bring into the club the more respected you'll be. The more obedient children you have the more impressive you look to your neighbors.
Pyramid scheme? No way! This is a sacred law of the Universe.