There are already wireless controllers from retrobit, but they're aftermarket, and this sorta iffy.
The plan I have is to offer wireless upgrade kits for original SNES and other controllers 
Luckily the SNES Controller's cord plugs in to the PCB,
instead of the soldiered connection that Sega did with their controllers.
Making a Wireless Upgrade for Sega Controllers is still doable, if Wiggy wants to do that too, but it could mean more work for him (or everyone).
If it's a do-it-yourself-kit, it would be nice if he also included
a new internal connector/plug you can soldier to a Sega Controller PCB, that could act as a plug,
so we could more easily switch back to Wired,
or quickly swap in a later revision/new version of his Wireless Upgrade Kits for Sega Controllers.
OR, he could just make a whole new, one-piece PCB, that will not require the end-user so soldier anything.
Actually, that would probably be the best option, since the original (pads on the PCB that the buttons jam into, in order to make an electrical bridge, unless it's magnetic) are probably worn out, anyway.
