KidA Seven
Member
The only reason SFIV likely continued to be a success is because of goodwill and the fact that people didn't care as much about single player fighting game content. You'll also notice the sales for SFIV dip noticeably after a specific amount of time.
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No, it stayed alive due to its tournament scene being streamed on twitch, and the tournament scene being supported by Capcom via prize money and updates. Players had more motivation to keep playing the game with new characters to learn, and some money to attend more tournaments. Instead of just 1 big tournament in EVO, there was now an end of the year Capcom tournament that started with the 25th Anniversary in 2012.
SF also has the most popular personalities and players. Other games don't have that.