Very interesting suggestions, and I certainly agree on Eustache, Tarkovski and Kieslowski. What a great and way too early loss. 
I just hope Ken McMullen will start making films again, because after having Jerzy Skolimowski finally making a new film after 15 years, makes me believe in almost anything. 
Can't believe the Victor Erice story though... what a @#%$ idiot this producer must be! 

I also wish like hengcs, to see many directors I like switch their style and way of filmmaking and do something completely new, but that would probably mean to change their personalitiy. 
But some experimenting would be great, though i guess there isn't really any money available for them, if they don't follow in what they've already done. Which producer would invest in Hou hsia-hsien if he would say that he wants to direct an action-film next?