^Not sure how you expect a "successful refuse" to play out. The Reapers cannot
be defeated by conventional means. This has been made abundantly clear since ME1 and was practically hammered into our skulls in ME3. Everything was riding on the crucible being the solution, without that, all there's going to be is a slow grind into extinction just like every other cycle.
Of all the issues I have with the endings, this isn't one of them. I actually liked how they implemented the "refuse" option in the EC.