I really hope we're headed towards a "It All Happened" approach to DCU continuity as well. Unfortunately, the tug-o-war over what did and didn't happened since 1985 will leave fans who fell in love with a specific status quo during that time out in the cold, but they're never going to be able to please everyone, nor should they try.
DC should establish that the broad strokes of their entire history took place and hand-wave any inconsistencies away as temporary glitches due to time shenanigans. Certain details will have to be fudged in regards to the Trinity, but restoring Wonder Woman to the Golden Age while keeping Superman and Batman as the beginning of the Modern Age that began in a perpetually sliding "15 Years Ago" timeline works just fine as neither of these two were really active participants in the JSA or All-Star Squadron during the 1940s.
In regards to the Flash characters, DC should stop trying to silo characters off from each other, and let creators use whomever they want for any particular story, be it in continuity or in a stand alone story.
I would love to see YA or kids-centric Flash comics focused on Bart, Wallace, Avery, Jesse, and Wally's family. My students have always loved the family and legacy aspect of the Flash, with the mantle being passed from one generation to the next in a line that stretches across time and dimensions. Hopefully, the Flashpoint movie, if it ever gets made, will lean into that concept even further.
The Flash has to be more than Barry Allen or Wally West. It has to be about everybody. With Didio gone, his aversion to legacy characters doesn't need to hold this franchise back anymore. I understand his thinking behind stripping these characters down to their simplest and most iconic incarnations in order to create stories that are easier to adapt for more profitable mediums, but Spider-Verse has blown that thinking out of the water. Modern audiences are ready for multiple flavors of the same idea. All it takes is talented creators to figure out how to adapt them properly.