With Harry about to cause another particle accelerator explosion I think Wally and Jesse are going to become speedsters, and I think they along with Barry will take down Zoom together. It would also be awesome for Jesse as Zoom had her captive for over a year and it would be the most awesome form of payback. Also Wally and Hunter are traditionally archenemies in the comics so it would be a good acknowledgement to the comics. Team Flash also still has a spare Reverse-Flash suit and Trajectory’s suit so they even have suits for Wally and Jesse to use.