I think I need to spell it out more clearly: Juan Linz was wrong.
(1) There are very few instances of democratic collapse in Latin America which involved partisan gridlock. The only one which clearly fits the bill is the Brazilian coup of 1964 ... except for the fact that Brazil tried a parliamentary system in 1960-63, which did nothing to resolve the country’s underlying political conflicts. Three others fit if you squint hard: the Argentine coup of 1966, the Honduran coup of 2009, and the Chilean coup of 1973. The latter, however, also involves a President who was in open defiance of the Supreme Court as well as Congress.
This is a small subset of the democratic collapses in Latin America.
(2) Now, Latin America is all presidential regimes, save the 19th-century Brazilian Empire and that brief early-Sixties experiment. But Africa has a mix of presidential and parliamentary systems. And on that continent, both systems are equally-likely to break down.
(3) Postwar Europe has not had a lot of democratic collapses, but there have been a few close calls. They do not fit the Linz formula. Perhaps the coups in Czechoslovakia and Hungary should not count, because they both involved the Soviet Union ... but they nonetheless occurred in parliamentary systems. The collapse of the Fourth French Republic was not a coup per se but it was certainly a constitutional breakdown ... and the Fourth French Republic was a parliamentary system. The 1982 putschists in Spain launched their assault on a parliamentary government. Finally, the 1960, 1971, 1980, and 1997 coups in Turkey overthrew prime ministers, not elected presidents.
The U.S. may go into a crisis. We may develop a political culture most unsuited to our constitutional structure. Jonathan Chait explores that idea here. But if that causes us to go into crisis, it won’t be because of our constitution per se.