No there won't. The Nexus line pushes technology forward, not backward.
Personal preference for a physical keyboard has nothing to do with "forward" or "backward".
The Nexus phones only target a specific type of user that is already a minority (despite how they perceive themselves on forum sites). Making a physical keyboard variant means that a device that already has limited appeal has further limited appeal. Anything's possible but I wouldn't expect to see such a device. If you really want an answer you'd have to ask Google. They determine what devices end up with the Nexus brand.
Was there a survey that convince these phone makers that nobody wants a keyboard? Are sales for keyboard less phone that much better than keyboard equip phone?
Take a look at existing sales figures. A survey would be needed for the opposite, actually.
I don't get how any one would mind a better way to type for the sake of the phone being just a ity bity thinner.
You'll be confused any time you assume that your preferences are universal and the masses don't agree with your preferences. I prefer
good physical keyboards (i.e. NOT the keyboard on my Droid) but I don't assume that everyone else does.
If sales are lower, I can tell you its not because nobody wants them, its because the manufaturers only want to make keyboard phones with low specs and features, or totally miss the point.. I used to have the LG ally, not because it was cheap, but because it was the only phone verizon offered with a real keyboard, and real face buttons(none of that capacative button substitute crap.)
You shot your own assertion in the first sentence in the foot. I mean, you say:
"If sales are lower, I can tell you its not because nobody wants them"
Yet you also point out that you bought a device with a keyboard only because of the keyboard. If people really want a keyboard they'll get one as you yourself stated. It's either a priority and the customer buys a device with a physical keyboard or it isn't and the customer compromises, buying a device without a physical keyboard.