Was re-watching the Flash and i found some in-universe logic that could bring us Kid-Flash on the TV show. In the episode Power Outage, Wells explained that all Barry needed to get his powers back was to put some electricity in his system. It worked and Barry was the Flash again, but what if the same applied to Wally? He was effected by the particle accelerator being used to get Barry back up to speed. (pun intended) However, in the following episodes, we did not see Wally showing any signs of super-speed. That's because he needs to be struck by lightning. It might seem mad to think this, but comment below if you don't believe me or if you have something to add.