As her capacity to survive
I disagree, I think the majority of people operate under a perspective that is unfairly scewed towards negativity when it comes to A-H. On the eve of war, Austria-Hungary was a stable nation. It was a major power, with an up-and-coming industry on track to seriously rival the other great powers, and a strong army (Seriously, as often as people joke about their failures in Serbia, not many nations could've fought a 3-4 front war for 4 years the way A-H did)
Their collapse after WW1 has led many people to view said collapse as an inevitability, when it was anything but. As I mentioned earlier, one of the biggest contributors to the ethnic tensions that tore the nation apart in the end was the fact that ethnic Austrians dominated the military high command, and had a somewhat outdated viewpoint towards their non-austrian subjects. Thus, they started treating them as seditionists with little to no evidence, and created actual sedition in the process. Faith in the state was only truly lost somewhere along the year 1917, some say even only in 1918 when the fronts actually started to collapse. Before the war, there was very little talk about seccession from the ethnic minorities. Even most nationalist polititians didn't wish for independent states, but mostly for a better status within the Empire. Hardliners pushed for a Slavic kingdom within the Empire to equal Hungary and Austria, and that opinion gained traction pretty easily, but even those hardliners didn't necessarily wish to leave to create their own country. People liked the Habsburg Empire, which was also helped strongly by the man in charge, Franz Joseph. He was a father figure to the empire, and people from all ethnicities looked up to the man. A collapse of A-H after a victorious war that lasted two years shorter than OTL is, in my opinion, highly unlikely.
Of course it's not perfect, there are cracks, and the war will expose some and create new ones (as I mentioned, 2.5 years is still enough for Austrian high-command to damage relations with the minorities), but those cracks can be mended. Austria-Hungary is not paradise, of course not, but it is a far far cry away from the "Prison of Nations" that Brittish journalists (and slavic nationalists after the collapse) called it.