A new report estimates that despite intensifying competition and the possibility of subscriber saturation, Netflix (NASDAQ: NFLX) will have more than 175 million subscribers within four years — more than double its current worldwide subscribership of 75 million. And the vast majority of that growth will still be in the United States.

The Netflix company logo is seen at Netflix headquarters in Los Gatos, CA on Wednesday, April 13, 2011. AFP PHOTO / Ryan Anson (Photo credit should read Ryan Anson/AFP/Getty Images)