Yes please!
Though it all comes down to the UI. If it's anything like my Sony TX5 and it has 4 custom shortcuts on the left of the screen to quickly change settings, then definitely! However if it is terribly implemented, then I couldn't care less.
I think having a touchscreen could work really well with the NEX. Keep the SLT's Alphas for those who want a small form factor size with manual controls through physical buttons and make the NEX 'tech gadgety casual orientated' with less buttons (like it is now) BUT now allow the option for full manual controls via a touch screen.
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Straylight Run
It all definitely does not come down simply to the UI. There are things that do not benefit from direct finger manipulation on screen. The only purpose of creating a touchable user interface is to get manipulation directly on the object. If it's a virtual object, it removes the need for another layer of control, such as mouse, keyboard or button. So, anything that was already displayed as an interface element that could be selected (such as a button or a menu) on the screen might be able to benefit from direct touch. If it's a physical object, you create a new layer of indirection.
For example, tapping on the screen to take a picture is nothing but mimicking a physical control. It adds clutter to the interface -- it was delegated to a button outside of the screen, and now it's on a button inside the screen. There's no way it improves usability when you already have much more important information trying to be displayed in the same space: the live view.
I suppose we can argue about using a much bigger screen, with the a live view with the same size as before and the rest of the space showing virtual controls. Either the size of the camera increases or physical buttons are removed. By removing physical buttons, you increase flexibility for control arrangement, but you lose tactical feedback. Because of that, you can no longer rely on not looking at the screen. Another effect of losing tact is that you lose accuracy. Imagine focusing or zooming: that's lens functionality you can try to put on the screen. Remember your P&S with zoom? How much more accurate was it to use those little W/T buttons to zoom? Now, same thing with focus. It will be similar if you have that on the screen and maybe even worse. So, you can't really afford to lose physical controls yet. You can then make them more flexible and suddenly you have something that resembles the NEX's interface.
By the way, this reminds me of the issue of having an EVF on the NEX, since you either must have a comparably high resolution on the EVF to have the same ability to display custom controls as you do with the live view or you have to keep checking live view when changing anything.
And, finally, how will the camera be held? The firm way people usually hold cameras is with one hand under the lens and another on the right side of the camera (for right handed people). This is not only because of the good support it provides, but also because you can then use one hand to manipulate functions of the lens -- such as zoom, aperture, focus, iFunction, etc -- and the other to manipulate functions of the camera. So, when considering a touch screen, you have to first consider how it will be reached so hand movement can be minimized.
Fran