One of the most recent inter-city routes to open, the Borealis service between Chicago and St. Paul, far surpassed expected ridership levels in its first year servicing 212K passengers over a projected 155K [1]. This comes despite the fact the trip would be faster not only by air but also by car. I doubt we'd see this sort of overperformance if "most people don't want trains".
[1]: https://www.news8000.com/news/amtraks-borealis-line-celebrat...