Strikes me, the most level-headed Leaguers (Supes, J'onn, WW, et al.) would say, "We all run the risk, even when others say that we should not. He has too, and pulled his weight, and that is what matters."
The bigger problem is that with Cap, Supes, WW, MM, GL, and Flash all on board, you've got to throw nothing less than Darkseid at them every other month just to keep it interesting. Or write a deeply clever story. Some writers can do it, but not many.