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Check out Shumway - it can play SWFs in the browser without using Flash: http://mozilla.github.io/shumway/

If you have the SWF, you can run them in the Flash Projector, the standalone Player. What'll be problematic is if they preload resources from external locations.

You could do just that with a modern.ie VM today. The biggest challenge there is ripping the flash and all its assets (and maybe patching it up to remove any dependencies on stale domains)

There are a lot of third-party Flash implementations. If the official Flash client becomes unusable, one of these open-source implementations will emerge as the new de-facto standard. I don't think we have to worry much about Flash's survival.

You Gnash , Lightspark and Shumway.

You can download SWF files with unplug for Firefox and such.