Well if Belgium can make a show based on Tetris that has lasted 22 years (Blokken), maybe Candy Crush is just crazy enough to work...
(I always thought Bejeweled actually could make a good game if done right- have a picture set up in the same way as the grid, answer questions to earn moves, the squares you clear on the grid are revealed in the picture, figure out the picture for bonus points, etc.)