Also from the Russian revolution it seems one of the ways it went wrong was lack of contemporary revolutions that were expected in other countries.
Obviously a descent into authoritarianism is where it went most grievously wrong. But seems posited that the shift towards national communism came somewhat from being isolated and turning inwards.
Hard to imagine revolutions bubbling out around countries now though, any rumblings get quickly quashed from outside. (Burkina Faso, Chile, etc etc)