Because it must be immortalized.
While you slept, #Sailor Moon was trending topic in Canada, Mexico and Worldwide! Even if it was just for a few minutes, it was pretty great to see her up there! :')
This appearance of her on the important social media DOESN'T mean she is officially coming back (yet), it just shows she's still floating around in people's minds. Once the seed is planted, the idea might get to the right channels and stuff can begin to happen. Don't lose hope! Sailor Moon trending on Twitter is an AMAZING thing. You'll see. :D