Let us not forget that it was arbitrary Gamecube code running on the Wii that gave us Wii access.
Let us not forget that it was arbitrary GBA code running on the DS that gave us the code jump to NDS mode.
And let us not forget that it was arbitrary NDS code running on the 3DS that gave the 3DS team 3DS mode access.
OP, your thinking of that exploit "could work".
However, Ninty would already thought of that and patched it way before you even came up with it.
Personally, I think we're facing the same thing like with the Wii.
As they say, history repeats it self.
Wii code will pave the way for Wii U code.