Yes, we're in a different situation than people who preserve old console or PC games because those have a platform that is pretty much known and extensively documented. Even if you can't run the hardware anymore there are emulators that work great. It's harder on closed platforms like Nintendo.
With Flash, I don't know that we'll ever have an open source desktop player to allow preserving these games and allowing them to play on all future platforms. You might as well ask someone to write a complete implementation of Java, with no access to the source code, for free. Eventually we'll probably be stuck with old virtualized editions of windows running old versions of Flash. Let alone the possibility of leaving x86 behind completely.
With Flash, I don't know that we'll ever have an open source desktop player to allow preserving these games and allowing them to play on all future platforms. You might as well ask someone to write a complete implementation of Java, with no access to the source code, for free. Eventually we'll probably be stuck with old virtualized editions of windows running old versions of Flash. Let alone the possibility of leaving x86 behind completely.