I mean, if Marvel could do an Attack on Titan crossover, what's stopping DC to make a Goku/Superman team up?
Toriyama seems like the kind of guy that loves crossovers and the story can work in a simple way or something that would fit both universes (Universal Survival arc in DBS).
If Archie can crossover with Predator, Sharknado and the Punisher (and in today's case, Batman with Elmer fucking Fudd); what's stopping DC from pretty much winning the lottery with this crossover?