I have an Eye due to LittleBigPlanet primarily, and then picked up a couple of the 'demo' titles like Trials.
It's very probable I'll get the Wand and I'd say having an Eye just makes it much more likely, so while a sample of 1 is terrible, I'll go out on a limb and say I'd expect a majority of Eye owners to invest in the Wand unless they have been totally turned off by the experience. For example, if you have Eyepet, and Sony release a decent fun title for Wand that should appeal to same demographic, a purchase is probably a sure thing.
In the end while nothing huge, Sony will likely see an initial boost to Wand takeup via existing Eye owners. Not enough to make a huge difference I suspect, but no doubt better than a poke in the eye!
Try to be reasonable... its easier than you think...
