Just to give some insight on how the DQ mobile ports are doing, here's some figures.
Google Play Store (Worldwide Installs)
Dragon Quest ($2.99) 10,000-50,000
Dragon Quest II ($4.99) 1,000-5,000
Dragon Quest IV ($14.99) 1,000-5,000
Dragon Quest VIII ($19.99) 10,000-50,000
iPhone App Store (US Top 500 Paid Rankings by day)
Dragon Quest ($2.99) start (09/11/14) 14, 8, 13, 19, 20, 25, 42, 29, 31, 47, 75, 78, 122, 162, 135, 143, 180, 211, 273, 274, 287, 275, 225, 223, 163, 229, 315, 254, 80, 73, 83, 131, 161, 169, 146, 160, 195, 373, out (10/19/14), return (10/20/14) 495, out (10/21/14), return (10/23/14) 339, 318, 295, out (1/26/14), return (10/27/14) 370, 361, out (10/29/14), return (10/30/14) 448, 470, out (10/31/14), return (11/07/14) 407, 378, out (11/09/14)
Dragon Quest II ($4.99) start (10/09/14) 41, 35, 74, 107, 127, 137, 174, 298, out (10/17/14)
Dragon Quest IV ($14.99) start (08/07/14) 215, 156, 144, 173, 201, 267, 287, 397, out (08/15/14)
Dragon Quest VIII ($19.99) start (05/29/14) 108, 104, 152, 182, 198, 223, 228, 238, 317, 350, 416, 467, out (06/09/14), return (08/28/14) 400, 416, out (08/30/14)