Will there ever be another peacetime president?

[Dereich]

Carter's "peace" was based on continuing aid to brutal regimes, meaning he was funding war even if not actively participating.

Right, but he was still "better" than Reagan or Clinton. Sadly, we will never have a peacetime president.

And possibly never had

No, there were several peacetime presidents:
John Adams
John Quincy Adams
Zachary Taylor
Millard Fillmore
Franklin Pierce
Andrew Johnson
The Gilded Age Presidents
Theodore Roosevelt
William Taft
Calvin Coolidge
Herbert Hoover
Jimmy Carter.

Not quite.

Depending on what you call the Quasi-War, John Adams doesn't count either.