Just to use Xenoblade as an example comparable to Astral Chain, I remember media outlets hailing it as "the JRPG of the generation," and there was a big coordinated push to get it localized through Operation Rainfall. It had a large online following, and fan art and memes (Reyn Time, buncha jokers) were all over the place. People were consistently talking about the game for years before a sequel was announced.
Astral Chain feels like it came and went without making much of an impact. I'm not speaking to the financial success or quality of the game -- it's just a very difficult uphill battle for a one-off non-EPD game to get a Smash character, and I don't think Astral Chain is currently in the place it needs to be for that to happen. It feels more like an assist trophy IP to me right now.