Leverage: Redemption is one of the shows that has the highest probability of making a comeback. Electric Entertainment, the production company behind Leverage: Redemption, was founded by Dean Devlin, who served as executive producer on both the original show (alongside creators John Rogers and Chris Downey) and Redemption as well as directing quite a few episodes of both shows and writing an episode of Redemption (he co-wrote the story of "The Too Many Rembrandts Job" alongside John and Chris) so they're not lacking in support on the production side, its just a matter of finding someone actually willing to air it.

I'm not saying it will happen, I'm just saying it has a better chance than most.