I guess it is a matter of definition. I think the director's you are listed are great auteurs,rather than arthouse directors. Would you classify Kubrick as arthouse director?
I think I see your point. That's why I hate the term 'art house' in the first place. But generally I think being classified as 'art house' or not has more to do with marketing and financial success than the actual films themselves. You make a good point with Kubrick, if he wouldn't be as popular as he is he would definitely be considered art house.
Well they (the directors I mentioned in previous post) could be defined as
auteurs today, but I think that
auteurs were originally Hollywood directors (and other commercial film directors) who didn't write their scripts or edit their own films but left a unique mark on their films. Directors that defined auteur theory are guys like Alfred Hitchcock, John Ford, John Huston, and Howard Hawks. Once you get to defining 'art house' you have less conventional directors (usually from outside the U.S.) like Bergman, Fellini, Antonioni, Godard, Truffaut, Bresson, Tarkovsky, etc.
Today I think both 'art house' and 'auteur' are terms that have changed their meaning. 'Autuers' can now also be directors who do many things on their films (edit, write, score, act, etc.) rather than just outstanding commercial film directors with a distinctive mise-en-scene or common themes. 'Art house' films now include just about any foreign film that's not too mainstream, as well as unconventional films.
If Bergman or Fellini are not art house though, then I don't know who is. I mean of course guys like Tsai Ming-liang, Bela Tarr, Hong Sang-soo, and Apichatpong Weerasethakul are definitely art house. But I think that those original European directors of the 50's and 60's (along with Kurosawa) are the original 'art house' directors (whatever that means).