I don't think this is very inconsistent with their old behavior.
Layton:
Layton 1 LTD: 1,002,561
Layton 2: 945,630
Layton 3: 872,170
Layton 4: 676,069
Layton 5: 394,003
Layton 6: 249,366
Layton 7: Turned into mobile version of a party board game themed like Layton
Inazuma:
Inazuma 1: 401,820
Inazuma 2: 1,157,346
Inazuma 3: 1,018,381
Inazuma 3-2: 461,791
Inazuma 4: 440,623
Inazuma 5: 277,207
Inazuma 6: MIA
Little Battlers:
LB1: 328,323
LB Boost: 192,189
LB Boost 3DS: 180,873
LB W: 155,877/28,800
LB Sim A: 64,885
LB Sim B: 71,632
LB Next: MIA
Guild:
Guild 01: 33,311
Guild 02: eShop Exclusive
Guild 03: MIA
Time Travelers:
TT: 21,000
TT2: MIA
Girl's RPG: Cinderelife:
GRPG: 32,258
GRPG 2: MIA
Paul Sloane & Des MacHale's Intriguing Tales:
Game 1: 207,373
Game 2: 108,220
Game 3: MIA
Ni no Kuni:
DS: 575,629
PS3: 155,285
Next: MIA as it stands, maybe E3, but I'm not holding my breath
Fantasy Life:
Fantasy Life: 288,271
Fantasy Life Expac: 67,256
Fantasy Life 2: Mobile Game
I guess they dumped Fantasy Life a bit earlier than some of their series, but this is about the right sales volume where they dump a series, and their bar has been raised.
Also they didn't have as much confidence in generating rock solid hits back when they were more generous with entry count in low volume series.