While the question of whether that was actually a double-turn with Roman Reigns and Braun Strowman was the most interesting question coming out of Great Balls of Fire, the biggest long-term issue may be what's next for Samoa Joe after his main event with Brock Lesnar.
Lesnar vs. Joe offered few surprises, mostly delivering on what everyone thought it would be. Joe was a credible threat to Lesnar (despite having to cheat to get most of his offense) before losing in about six minutes. The match felt like the big fight that it was built up to be and Joe more than held his own.
There were minor issues with it. The match might have been better if it got a few more minutes. Joe might have been able to come out of it stronger if it took more than one F5 to put him down, though that would've hurt the story of him getting caught when he almost had Lesnar beat. Either way, the end result would have been the same. Joe is better off for having shared the ring with one of WWE's only elite attractions.