People like it so much, they can't wait for Flappy Bird on cart. No news of anyone making Angry Birds, Twirly Copter, or Fruit Ninja though, for some reason.
People can have all the
Flappy Creepy Bird they wants:
And plenty of match three games exist. There are Columbs clones on NES and Atari. Tetris Attack was problably the original match three game where you swap tiles. Games like Zoo Keeper expanded the concept by filling the screen and allowing matches both horizontally and vertically. My mom really enjoys playing Bejeweled 3 on the MiniMac. I'm sure Candy Crush and Fruit Ninja are the same concept except they put power-ups behind a pay wall. I wish Bejeweled 3 supported USB gamepad as input. I could probably swap tiles faster that way instead of using a mouse.
All comes down to level design. If the levels were the exact same as on the NES, most levels weren't designed for you to keep moving without ever stopping, so having to play it that way would naturally make it harder, especially if the entire level was synchronized to the start of the level and could be thrown off by you bumping into something and getting slowed down.
Yes level design is paramount although Flappy Bird's claim to fame is that the levels are randomly generated so it's a different game every time. And I never suggested one-button platformers were a bad idea but level design has to be approached differently. I still feel that you lose a lot of depth in the gameplay by not allowing full control of the main character. It also limits what the devs can do with level design.
But with a one button platformer, there are two ways to approach it: low speed, which screams casual and boring, and high speed, using basically speedrun techniques requiring you to make a path through the level forcing you to memorize the obstacles and execute jumps perfectly as the only way to beat it.