title_body: To what extent have C. arabica beans been replaced by rust-resistant cultivars?
upvoted_answer: Even with the impact of below average crop yields from Coffee Rust, Arabica beans still make up at least 75% of the world's coffee crop. Although they are affected by the rust, Arabica plantations will tend to recover within a few years and go back to business as usual. 
  
  CLR resistant varieties aren't without problems. They are still vulnerable to other desease that can have an impact on crops. 
  
  USDA report on Coffee Rust impact to Arabica crops
  
  2014 article on the Impact of Coffee Rust