I would say cheap oil wipes out cabal/terrorist profits. Figure Iran is up shit creek, because their sanctioned oil black market sales aren't bringing in money. If they sold any before the price cash, those buyers will just refuse delivery.
I think Iran plays big in the China One Belt One Road project, too. Say Iran is flipped and becomes a friendly commerce partner. They'd become a competitor to China, like India.
POTUS calling out Kerry in the PC yesterday was a big tell. I don't think that happens unless the deal is done already. Watch for a new Iran assassination. My take is that Kerry is being set up as the kiss of death. Negotiating with him means you're kissing you're ass goodbye. He's being tracked. By the time the good guys are finished, Kerry will end up being chased by all the players. Think of a Carrie Fisher, The Good Old Boys, the Illinois Nazis and Chicago/Illinois's finest type chase, and double it.
I agree with the anon who said China, or the Cabal hiding in China, are at the, 'backs against the wall', stage.