No. I don't think Apple or anyone else should be forced to "include" flash or even implement it. If Adobe wants to support Flash on some platform they have to implement it themself and if there are technical limitations its Adobes problem to work around them.
But Adobe has made flash work on the iPhone it ist just prohibited by Apple. So the reasons are not technical.
Yes, a "proof of concept"; In real world speak, and in its current form, they call that "Mickey Mouse". Because...
Yes, maybe it uses resources and drains the battery but any other graphical intense App (games etc) does the same.
...but a graphical intense app delivers intense graphics in exchange. You are asking for approval of an app at the "fart app" level of complexity to consume the same amount of resources.
Btw: You can download a browser for the Wii that is based on Opera and yes, it does support flash.
The browser for the DS does not, but I think given the specs of the device it is really not possible (it won't play HTML5 video either).
Christian
Just as I expected. Thank you.