2020 is an uphill climb for both sides. Republicans are not favored to take back the House, Democrats have a tough road to a senate majority.
2024 only if Trump is reelected. Democrats would keep the House and most likely take back the senate in 2022. In 2024, a Democratic president will get elected. If Trump loses 2020, the Democrats might win back the senate, but it's more likely they don't. If they don't, divided government probably lasts at least to the 2028 cycle, because a Democratic president (or Biden's vice president if he is #46 and retires after one term) is still favored to win 2024 (especially due to demographic trends).
The bigger question is whether any trifecta will last longer than two years?
The Republican Trifecta lasted longer than two years under Bush.
Can't speak for President Johnson but I really don't think it was the intent to take past trifectas into consideration, considering his entire comment was in relation to future trifectas.
Yes, my remarks or my question were more about the future. The 2002 midterm were some sort of anomaly due to the post 9/11 rally around the flag feelings. But even in recent decades, if you don't count the Bush Administration, the last trifecta that lasted for full four years was the Carter presidency. Before that, you need to go to the Kennedy/Johnson years.
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