You'll be waiting a long time I'm afraid. QWERTY phones aren't coming back.
I'm hanging on to mine (Desire Z). After replacing the battery (ahem) it looks like there are years more life left in it. Sure, I also have a slab-only phone and these days I carry it most of the time, but when I travel the Desire Z with full keyboard is generally more useful by being much faster at communcating.