I Guess Sly Cooper's Gone For Good Now?

Sanzaru Games is part of Oculus now, so it seems unlikely the studio will get the chance to resolve the cliffhanger it left Sly Cooper on.
Sanzaru Games is an Oculus Studio now and is unlikely to return to the PlayStation mascot.

Sly Cooper - Sly Cooper added a new photo.

Chronicle Studios the Art of Dylan Cooper

Every Song On the Guardians of the Galaxy Soundtracks, Ranked

There is no new Sly Game, maybe the real Sly game was the friends we made along the way : r/Slycooper

Sly Cooper Wiki

Sly Cooper Confessions! — “If Sly 5 does see the light of day, one of the

Sly Cooper: Thief of Virtue Page 107 by ConnorDavidson on DeviantArt

One interesting detail I think is cool is at the end of the 2nd episode of Sly 3, The Guru is confused at the Cooper Gang for the first few pictures and

Comics with Uzi - Comic Studio

cohost! - post from @Zerio

The Untold Story of the Psychic that Predicted Sly 4's title in 2007 and Created Sly Cooper World ​

Best Bridges of the 21st Century: Billboard Top 100 – Billboard

Sly Cooper: Thief of Virtue Page 346 by ConnorDavidson on DeviantArt