Warner Bros. is going to need content, and a Deathstroke-centric project (whether it be a full series or a miniseries) is a perfect candidate.
Slade is already a known enemy of the Titans, so bringing in Manu Bennett’s version of the character to face off against the team could even represent a perfect catalyst for a live-action adaptation of The Judas Contract at some point.
A Deathstroke solo project has become even more possible for DC because of the infrastructure that the company is beginning to establish.
After all, a DC-specific streaming service is currently in development, and it will function as the platform for a live-action Teen Titans show, as well as Season 3 of Young Justice.