Tricky.
I'm deeply conflicted, because to me Barry Allen will always be the Flash,
at the same time I loved the progression that Wally went through from
teen sidekick to fully fledged hero, who arguably surpassed his mentor.
While I'm glad Barry's around, at the same time, I kind of wish he'd stayed dead. The worst thing Marvel ever did, well one of the worst things, was bringing back Jean Grey.
The idea that comic book death could be reasonably permanent made the stakes that much higher, and the sacrifice of those characters, especially
Barry, that much more significant. And that DC would kill off a major hero
like that (I'm talking original "Crisis" people, which is still infinitely better
than final crisis, IMO).
Plus, there was also the plot device that would have allowed Barry to temporarily escape from his death run and appear in contemporary storylines.
Really, I haven't followed Flash for a while, but I have no problems with
having both Barry and Wally as the Flash - hell, I'm okay with the whole
Flash family.....well okay I find Bart annoying. I remember back in the
day when they started introducing Max Mercury and all the other speedsters,
I thought it was well done, and developed Wally as a character.
Plus, Wally's struggle to come out from Barry's long shadow has been a process taking decades. It'll be interesting to see where Wally's path takes him this time around.....well until the next retcon anyway.
So, welcome back Wally !
So I guess Wally's reappearance is good news.