In my opinion, gnash, icedtea (openjdk = free java) and similar projects can go take a long walk off a short pier. They're trying the impossible, which is to re-do something with no idea how it was originally done. It's pretty much like trying to assemble a kit car just by looking at an assembled one (no peeking inside!), and the results will inevitably be inferior
Let's keep in mind that MIDs usually use arm architectures or similiar, not x86 as in PCs. Sometimes all it takes to make a mobile version is to recompile the code. Other times it's not that simple. Also, flash 10 is hardware-accelerated. Making it work with the gazillions of hardware combinations out there is no easy task. I don't think adobe is moving slow because they don't care (they do lose market share on sites made for mobiles, which would avoid flash), but because it's not that easy