I mean, maybe this old player likes to play Street Fighter games?
I know certain fighting game franchise fans get really attached to their favorite characters, and I get that, but these fans tend to make them seem so much more important than they actually are. If people were only willing to play characters they already knew then Street Fighter 2 never would have been a success in the first place. Nobody would have bothered with Mortal Kombat, SNK would have failed immediately, Namco never would have bothered launching Tekken (to say nothing of Soul Edge!), etc. (To be fair, Smash would have been okay.)
You make a fun fighting game, you market it well, and people will play it. Capcom isn't losing hundreds of thousands of potential players because they haven't included Blanka in SF5. Returning characters make marketing slightly easier, of course, but it's not some enormous issue.
A new cast wasn't even in SF3's top three issues for a relative lack of success. It had problems more because it had a tiny cast, its hardware was expensive and unwanted, it didn't get good console ports for ages, it was released in a rushed state, the arcade market was dying in the US, and so on. Those were all far bigger issues than not including E. Honda and Sagat. We can see that releasing an unfinished fighter absolutely crushed SF5, that alone is a major, massive handicap.