Alberta is where the buck stops for housing because residential construction in our two major cities can scale up essentially infinitely.Yes, we can absorb more than a smaller city, but also remember the higher priced cities people are leaving are twice as large to five times our size.
This is why Calgary is now having trouble absorbing the newcomers (or at least why rents are going up a lot there).
Calgary will continue absorbing a high % of prairie-bound newcomers as it's the most prominent Prairie city. When Calgary's residential construction gets overwhelmed, Edmonton will pick up the excess until Calgary ramps up enough to handle the inflow. With 7% vacancy in Edmonton, we definitely have some breathing room.
The critical point is this: to keep housing supply + demand balanced, we don't need Prairie migration to slow down or even to stagnate. We just need it to return to modest y/y increases, which seems likely now that the post-covid shock is over.