Republicans continue growing with non-college Whites, but with White voters becoming more educated cycle-after-cycle there's still plenty of room for Democrats to grow in the suburbs. However, what will eventually break Democrats' advantage in the popular vote will be when Blacks/Latinos in the rural South/West dramatically swing toward the GOP once the Democrats anti-climatically sell-out to the globalists.
You really think the next realignment will happen because the Dems sign a free trade deal with India in 2036, causing (presumably depopulated) Yazoo County to swing 25 points to the right, thus somehow transforming the electoral map? Seems flimsy to me.