Decompilation means that they can deterministically recompile the code and get the original ROM back minus assets. Someone may be able to wedge in shims of emulator code for the subsystems that need it. But at that point you’re still emulating realistically and still dealing with bottlenecks. The true power of a native Port would open it up to Modern graphics apis larger faster system bus etc that wasn’t available initially. It’s going to take a bit more programming work before you see something that really blows the doors off emulation. But it will happen.