"Linus: ..." "...I used to think that some radical new and exciting OS would come around and supplant Linux some day (hey, back in 1994 I probably still thought that maybe Hurd would do it!), but it's not just that we've been doing this for a long time and are still doing very well, I've also come to realize that making a new operating system is just way harder than I ever thought.
...”

https://www.linuxjournal.com/content/25-years-later-interview-linus-torvalds