That's true. Would be nice if Adobe at least threw some resources at it though.

It's a huge undertaking. There are just a ton of library calls to support. Here's the list of AS3.0 classes: http://help.adobe.com/en_US/FlashPlatform/reference/actionsc...

And a whole lot of games are still in AS2 - game developers never really embraced AS3.

It really isn't going to happen, I'm afraid.

EDIT - Maybe it's possible to compile the C++ sources for the Flash Player to WebAssembly? Then you wouldn't have to re-implement the libraries.

I don't know the state of these compilers, but there was a Mozilla post about it a while back: https://hacks.mozilla.org/2015/12/compiling-to-webassembly-i....

Adobe hasn't open sourced the Flash Player, so it would have to be them.