It seem to me that what determines whether — and where — fascism survives is how globalisation develops.
Ron Rogowski in his 1989 book Commerce and Coalitions: How Trade Affects Domestic Political Alignments, argues that European fascism arose because of the collapse of globalisation following World War I. The book, studying the interwar and postwar periods, argues — although Spain under Franco and Portugal under the Estado Novo is not covered at all — that expanding trade via globalisation was certain to weaken the sections of society upon which European fascism depended for support. Thus, the reutrn to freer trade after World War I, and especially after the 1973 oil crisis, made the downfall of fascism or fascist-like regimes in Spain and Portugal impossible to prevent, because labour — their abundant factor of production — was gaining from expanding trade, whilst land — their scarce factor, but the one upon which the fascist regimes depended — was being outcompeted by the Western Hemisphere, Australia, Africa and northern Asia.
If he had studied Portugal during the Estado Novo period, Rogowski would have noted that owing to its large colonial holdings in Southern Africa and resultant international sanctions after the Colonial War, Portugal took a very limited part in the postwar expansion of trade. The Salazar regime and its primary support base in the Catholic Church and large landowners was strengthened by sanctions — unlike the situation in South Africa or Rhodesia which he also does not discuss.
In the past on this site I have imagined that Mussolini, if he had stayed neutral in World War II, could have been in a similar, but much stronger, position to Salazar, and with the hindsight of Rogowski, it is not impossible to my mind that the Fascist regime in Italy could have survived to today. If fascist nations came to serve as labour sources for (Gulf) oil monarchies, they also could certainly survive indefintely. There is no doubt that this semi-rentier economy is critical to preventing democratisation in the Levant, Pakistan and Tajikistan.