I don't know of any other evidence for dark energy, other than that mathematical physicists think the equations would be prettier with some, although they sort of wish there was more. It is quite embarrassing that the value was so close to zero without being zero, so that might be one embarrassment less.

We already knew there was likely to be something fishy about the most distant supernovas, because we have two divergent values for the Hubble constant, one of them based on these same supernovas.