I've been in domains long enough to think anything is possible, .xyz, .io, .ai, and others have shot up when it seemed impossible or unlikely. So why not .si?
Will .si be huge? I doubt it, but it could become say a subcategory of domain sales related to AI for companies that want to differentiate as Super Intelligence. There is still a lot of investment being made into AI in the coming years, at least in forecasts. The rise of .ai happened slowly, I could have invested in some good ones but never thought to bother, never thought they could command six figure sales like they have. The high reg price also made it hard to speculate in, whereas .si might be more prone to speculators since you can register one for under $15 US.
I wonder how the country of Slovenia would feel about it's .si gaining significant traction from speculators and companies in the AI/SI space?