It's always awkward finding a believable way to end an 'invincible' storyline that isn't jarring and it only gets worse when you've been stringing it along for years.
Should have had the Bloodline slowly collaspe after the Usos lost the tag titles. WWE teased it, but it was apparently just to seperate Jey.
Despite the commentators selective amnesia after any Roman match ignoring the interference and pushing him as a dominate champion, everyone can see he only wins with the Bloodline. Follow through with the eventual split after the Usos lost the title, leaving an isolated, but still arrogant Roman Reigns thinking he can do it alone, he is the tribal chief etc. Standard Roman match, Roman on the backfoot, ref goes down, except this time he realises he is alone and there is no help. Cody wins.
Perfectly believable. Everyone with eyes (except the commentators) can see that for the past 4 years Roman is only invinicible because of the Bloodline, because every Roman match is basically the same. So without the Bloodline, Roman loses.
Everyone assumed this was where the tease of the split was going because it made sense.
Instead we are left with either.
Rock loses, probably the same way as everyone else, Roman's title reign is dragged out even more with him barely showing up.
Rock wins, the rest of your roster looks like a joke. For years no one could beat Roman, but a 50 year old man who hasn't wrestled in years can.