It's already difficult though say it will get to 90$.. thing is this spike isn't a result of usage shortage at moment, more fear about more crisis developing. If the things worsen and escalate taking more time than markets is now pricing in than could really go ballistic and maybe will see 100$ in summer. Gulf situations is on the verge IMO.. All those rich gulf states rely on Oil and Tourism (high financial and real estate). If cut out from revenues and supplies (blocks of airports and Ormuz) they can't sustain a long period of crisis without huge repercussions.