I made some translations from the tweets by the game center manager...
Fantasista Manager:
"We decided to remove Pokken around early November. Even though it was a short period of time, we thank everyone for playing and supporting."
Fantasista Manager:
"Unfortunately, red numbers are confirmed and losses for Pokken is a fact. At this rate and pace, no profits would be made for the next 3 years. So we decided to sell the cabinets since home version will also be sold."
EDIT 3:
@riri510
EDIT 2: In one of the Japanese Arcade
EDIT: Fixed the links