I think the worst is that we will lose this dynamic as ever.. It is the first thing I thought to know this
Although this happen for old fans, and for this fans now EVERYTHING is possible, I doubt that they do not want more:
-both parents in the Daily Planet(Current Lois is Dying.. nothing surprisingly)
-Superman gives him the key of Fortress of Solitude, now or in Rebirth.
-Supergirl in 2017 appears with this character. Nothing happen..
Now I know the past of Hal Jordan and Barry Allen and the years they were missing(11 and 25 years), I have removed all hope. DC continue without him.