Cyber Sleuth won't be the best selling one. Digging up MC data (since Famitsu seems to be off by a considerable amount) shows that Reigitize on PSP did 172k. Famitsu had the first Digimon Story on DS and the first Digimon World on PSone over 200k, but I'm not digging up those MC numbers (if any exist for the latter).
Assuming Adventure Tri isn't getting delayed, the game could continue to have some legs.
Well, the anime already got delayed, since broadcast plans will be announced on May 6th.