One thing about The Flash that's undeniable is that, for a TV budget, the special effects are outstanding. Between Barry, Kid Flash, Gorilla Grodd, King Shark, and the other various speedsters, villains, etc the show proves that no villain is too big or too small. One area of expertise that the VFX guys have nailed is the speedsters. It started with Barry then we got the Reverse Flash, Zoom, Jay Garrick, Trajectory, Kid Flash, Rival, Jesse Quick, Savitar and others I'm probably forgetting. I probably named them all . . .
Anyway! DC Comics is not short of any speedsters. There's ones from the future, the past, alternate Earths, I mean it's crazy! The Flash hasn't been shy about using these characters and tweaking their stories as they see fit.
My fondest memories of Bart Allen were from Geoff Johns's run on Teen Titans. By then he had graduated to Kid Flash. He was a great character and a lot of fun to read. When he was killed off I was very upset. Luckily, Johns must have felt the same way and brought him back. His origin seems to have been changed somewhat since the New 52 which bugs me. However, that may get rectified soon enough with Rebirth making changes like bringing back characters and, at least somewhat, retconning their origins.
I'm hoping he'll come into the Flash in the near future. I have a sneaking suspicion that due to Barry seeing his own future, albeit only six months from now, that we're on the way to him seeing much further on and possibly even encountering Bart. I think that would be a great story and hilarious to see a young Bart calling 26-27 year old Barry "grandpa." With season 4 officially announced I'm sure we'll see Bart sometime in the future (pun intended).