It's far from slim - it's very likely USD and EUR hegemony will be challenged. Western financial systems are ultimately and inherently discriminatory towards any non-western countries. Where for westerners using those systems enjoy reliability and predictability, the same systems implicitly (and recently, more explicitly) punish non-westerners with excessive compliance and scrutiny. So, basically, if you're from a non-western country, good luck not having your money confiscated or fronzen at some point - and this applies both on state-level and individual level. Of course sensible countries will seek alternatives and will create ways to bypass this elitist bullshit. The whole thing is literally nothing else but inertia at this point and over time both USD and EUR systems are destined to become merely regional.