I seem to remember hearing something about this ages ago and to be honest was pretty interested in it then..
It is pretty cheap and I'm sure a lot of people would be interested.. lets see though before we start to jump for joy.
It's not as if its a silly thing to do either with the SNES version of the GBA selling like hot cakes it makes sense to release something like this as there is most certainly a demand for it.
Problem for me, is that I have a PC that can play 99% of all old C64 games and never bother to run a single game now.
There is the argument that a plug & play unit would be viable I spose. It will probably appeal to the coffee table enthusiast who likes to remember the 80s.