I honestly think she'd have a decent shot of being popular in the long run though. She usually has a significant casual playerbase in the SF games, and she's not considered super-complicated (IIRC) which gives her a lot of people using her at all levels.
Also, recall
this Japanese survey.
was 7th most popular - sure he's DLC and has flashy super moves (something Chun might not have), but it still bodes well for Chun's potential popularity in Ultimate's lifespan.
and
are much lower granted, but Ken's at 59th and Ryu's 71st, with a 30 vote gap. Sure both Ken and Ryu are quite technical, but Ken probably benefits from having flashier combo routes etc. It's also partly because Ryu depends a lot more on confirming into his (Shakunetsu) Hadokens, making playing him on an intermediate level a bit trickier - partly since his Tatsu is a combo finisher / kill move while Ken's Tatsu extends combos.
Ultimategamedata's
low-level wi-fi stats (not going to stop using it!) has somewhat similar results: Ryu's down there at 78th (7th least used, with
likely overtaking him in terms of usage soon), Ken is middle-of-the-pack at 45th place, and Terry's the 19th most used character in Wi-Fi.
And finally, the competitive scene.
This is also online, so it's going to have some jank (
has a notoriously difficult time online, competitive
mains are super-rare but super-dedicated desynch masters that will covert one grab into like 50 %, which is probably more difficult to escape from online), but this chart is worth noting:
Again, while Ryu's the least used of the three FGC characters, there's a massive jump to Ken and then another big jump to Terry.
Worth noting that in the Street Fighter popularity poll,
Chun placed 6th, Ryu 9th and Ken 15th out of 109 characters. Combine that with her being DLC in this scenario, and yeah I'll reiterate that she has a decent-to-pretty-good chance of being popular in the long haul.