I think part of the root of disagreement here may lie in your belief that "facing the ending" would have good results. I don't know about Kabooooom, but I don't think a fix is possible no matter how much effort they put into it.
In a sense, I agree with you. It is too late to retcon a good ending for the trilogy, that camel has already fed the vultures. What is possible, in my opinion, is restoring the galaxy to a basically useable state.
As many have noted previously, if you assume cyber-reaper-blue-Shep would leave for some reason and go someplace unknown to mere mortals, the differences between red and blue blur into indistinction with the passing of a century or two. I think most of us are completely ok with "Time passed since Shepard beat the reapers and they died or disappeared." Asari and Krogan have long lifespans, so familiar faces are not impossible, but more importantly we'd be able to visit the Citadel, Omega, Ilum, Tuchanka, Rannoch, etc. Those places might be a lot different 200 years after the reaper war, but there would be story based reasons for it. There would be context for whatever characters and conflict we run into in ME4, and it would really be a Mass Effect game, and not some spin-off.