It's possible that enough Republicans will be looking for a clean break with Trump and may be willing to get Vance in his place, especially with Trump's recent dealings with Russia and Ukraine. The MAGA voting base is looking less devoted with the recent economic developments as well and might not be so keen on his candidates in 2029. Also, if dems get the majority we may be seeing more Epstein revelations in the news.

But like I said, this is the very best case scenario. Most likely Trump will just be to busy handling an investigation and an adversarial Congress to do much but make noise on social media.