As of November 30, 2025, this prediction is still framed for the "coming years", and only about five months have elapsed since it was made on June 28, 2025. That is not enough time to judge whether it ultimately comes true as a long‑run description of U.S. national politics.

Substantively, current evidence is mixed rather than clearly validating or falsifying the claim:

• Within the GOP, a large share of voters do identify as “MAGA Republicans” (around half of Republicans, depending on the poll), showing strong populist‑nationalist influence but not total dominance. Many Republicans explicitly do not identify as MAGA, indicating an ongoing split between MAGA and more traditional/establishment conservatives. (today.yougov.com)
• On the Democratic side, democratic socialists like Zohran Mamdani (elected NYC mayor) are highly visible, but institutional power is still heavily held by moderates and centrists. The New Democrat Coalition, a pro‑business, Third‑Way, centrist group, is the largest ideological caucus among House Democrats, with over half of Democratic representatives as members. (en.wikipedia.org)
• Additional organizations such as Majority Democrats (a centrist PAC modeled on the old DLC) and the surviving Blue Dog Coalition of moderates show that non‑socialist, non‑populist factions remain organized and influential in the Democratic Party. (en.wikipedia.org)

Because:

1. The prediction is explicitly set over a multi‑year horizon ("coming years"), and that horizon has not yet passed.
2. Current party dynamics still show significant centrist/neoliberal and traditional conservative factions with real influence, instead of a fully crystallized binary "MAGA vs. socialism" structure.

…it is too early to say whether U.S. national politics will in fact solidify into the binary alignment described. Therefore the only defensible judgment today is inconclusive (too early) rather than right, wrong, or permanently ambiguous.