Honestly, does anyone think Kiwi has any chance of winning a grand slam regardless of who his coach is? I think Kiki's right in that at this point in his career he might as well work with someone he's friends with. His biggest hurdle at this point is his constant injury status. No coach is gonna change that. We've been dealing with that his whole career.
No chance whatsoever with Kiwi's current situation. But I think he has a slim chance if he switches to a more experienced, proven coach. Just look at what's happened to Fernando Gonzalez after hiring Larry Stefanki. Gonzalez, who's not nearly as talented as Kiwi, may not be a strong contender for grandslams but at least he always has an outside shot.
I do agree with you about Kiwi's constant injury problems but he usually has quite a long stretch of several months when he's injury-free. Nicolas can take advantage of this time to really perform well in grandslams and the Masters events. His only shining moments in the last 2-3 years that I can remember were reaching the Aussie Open semis in 06 and the Toronto final this year. That's way too inconsistent!
I'm sure Kiwi still dreams of winning a slam but if he sticks with Nensel and keeps the same routine, there's no chance in hell that his lifelong dream will ever come true...