The deadline that Saudi Arabia and its allies set for Qatar to submit to their "non-negotiable" demands has just been postponed from Monday to today. Since Qatar has already made it plain that it will not comply -- it says the demands are "reminiscent of the extreme and punitive conduct of 'bully' states that have historically resulted in war" -- the delay is a sure sign that the bullies don't know what to do next.
They presumably thought that the Qataris would buckle under their threat, and didn't bother to work out their next move if Qatar didn't. So what happens now? Does Saudi Arabia invade Qatar? It could easily do so if it wanted to: Qatar has one-tenth of Saudi Arabia's population, an undefended land border and tiny armed forces.
Saudi Arabia's Crown Prince Mohammed bin Salman has the support of Donald Trump in his blockade of Qatar, and he could probably talk Trump into accepting an invasion too. Moreover, this is the man who committed Saudi Arabian forces to the vicious civil war in Yemen on the mere (and largely unfounded) suspicion that Iran is helping the rebels militarily.
Bin Salman's terms for ending the blockade of Qatar were so harsh that it looks like he wanted them to be rejected. The 13 demands included completely shutting down the Qatar-based al-Jazeera media group, whose satellite-based television network is the least censored and most trusted news organisation in the Arab world.
Qatar was to break all contact with the Muslim Brotherhood, a largely non-violent and pro-democratic Islamic movement that was a leading force in the "Arab Spring" of 2010-11. It was to end all support for radical Islamist rebel groups in Syria, and above all for the organisation that was called the Nusra Front until late last year. (It then changed its name in an attempt to hide its ties to al-Qaeda.)