This is a really short-sighted perspective. Letting Flash die would be a serious contributor to bit rot. Archival of all the historical content created in Flash is a respectable goal even if we should _never use Flash again for anything new_.
Just because a piece of culture isn't exactly to your particular taste doesn't mean it shouldn't be preserved and it should be impossible for anyone to experience it in the future. And besides, that's a really selective and disingenuous generalization of Flash. There are a huge number of important, interesting Flash games that are worth preserving for history's sake.