Why would he wear and honor the uniform of a mass murderer? He will not wear the Kid Flash uniform either. There is a Kid Flash already and Wally has proven to be a adult hero in his own right. My guess is he will still be the Flash but just with a different more modern costume. Then he will get shoved into a group book only to be killed years later in a explosion of speed force just to piss all the fanboys off.
Who here would read a book called "Speed Force" about a team with Jay, Wally, Bart, and all the other flashes? Sounds like it could be good if handed to the right writer.