My fear is that some influencer/personality is going to start posting about the train system, and then it's going to become a crowded mess :P It feels a bit like a well kept secret right now. I think one of the things that makes it so enjoyable is that it's so uncrowded most of the time. I almost always get two seats to myself every time I take it (in coach). And there's somehow always a table available in the observation car whenever I decide to go there. Or you sit with someone and make a new friend :P
Would highly recommend!