Did you enroll in sarcasm 101 or something mb?
Yes an "EVIL thingy with D3S sensor" would still be cheaper than a fully watertight tank like Nikonos thingy with a D3S sensor. You are correct. An "EVIL thingy" doesn't need fully watertight tank like lenses to operate.
Why do you think that? Or we are being to serous now?
No I really think that compact live view approach would be better, cheaper and easier to implement and sealed for underwater photography than DSLR design. And I also think that, If Nikon must develop new sealed lenses for an underwater use, why not make new and more useful EVIL system in the process.
I doubt however that any of it will happen as the costs would be too high and it is always cheaper to developed waterproof exoskeleton housing than the whole new system and even more so for an EVIL thingy, OK?