As for jail, who knows. Seems like a longshot that a POTUS would do jail/prison time, but anyone else who did what he did sure would.
Jack Smith asked for the cases to be dismissed without prejudice (and they were), so they could theoretically be re-filed. As for his reasons, he listed them right in his court filing, all related to not being able to prosecute a sitting POTUS.
But let’s be real here: if Smith hadn’t dropped the charges, he’d have been bounced as Spec Counsel once Trump’s DOJ took over, the charges would still be dismissed, possibly with prejudice so they couldn’t be re-filed. But in 4 years, Trump will be 82, there was still probably a several years worth of legal wrangling, trials, appeals…. this is almost certainly over as far as Trump is concerned.
Despite a multi-state felony scheme to disenfranchise millions of voters, purposely stealing, lying about, and obstructing the theft of boxes of classified docs, despite inciting an insurrection, that fucker successfully manipulated and convinced enough people to put him right back in power where he’s shielded.
He may be one of the worst presidents ever, yet he’s gotta be the GOAT Con-man. It really is amazing.