Why don't they have a Raw in Japan nowadays?
The same reason they don't have a RAW in Toronto nowadays.
Incidentally, I think the only way to derail Cena at this point is to run an angle where Darren Young becomes a full-fledged Cena impersonator (complete with entrance music, haircut, merchandise shilling, no-selling, Cena 5MOD moveset, legally changing his name to John Felix Anthony Cena, Make-a-Wish foundation wish fulfillment, etc.) and making the argument that "John Cena the Brand" is what the WWE Universe wants and that the original Cena has no semblance of humanity left in him. That ANYONE can be John Cena the ringmaster/clown/no-selling/shill. That Cena Original is expendable. Even make the case that the locker room will like him more because the new Cena will put his neck on the line to save the faces in peril. And that he can sell their offense better. And will actually lose matches and not sabotage their gimmicks.
After a handful of weeks of duelling five-knuckle shuffles, attitude adjustments, STFs, book a Cena vs. Cena lumberjack match where the winner gets sole ownership of the Cena gimmick, entrance theme, merchandise revenue, etc. Have Cena Original lose after the faces let him get pummeled by the heels without lifting a finger.
He then actually leaves TV for a number of weeks. Wouldn't that be refreshing?
Incidentally, this would also free up Titus O'Neil to either be a bad ass singles heel or to be one amazing color commentator.
