I think a great example to look at is The Suicide Squad. If you look purely at the numbers, Suicide Squad (2016) brought in ~750m globally versus The Suicide Squad (2021) which brought in ~170m globally.

The first Suicide Squad was one of the worst DCEU films. The second The Suicide Squad was one of the best DCEU films and handed DC Studios to James Gunn (and Peter Safran).

I think looking purely at the numbers Superman is likely to come out as small victory (monetarily). However as a franchise, it's a solid start.