My take on HTC's „No QWERTY's” decision
Just think about it - the development and resources that go into a simple glass slab is pretty simple. The magic formula, if you wish, has already been brought to the table since 2007 - a black slab with a screen on top.
But a Hardware Keyboard phone, that's another story. In all the reviews of QWERTY phones, you see how they judge the feel, the grip, the resistance, the ease of use, the placement of keys. It's a whole domain of mobile phone research.
What the Desire Z brought new was it's „Z” sliding factor, which allowed it to be very slim compared to other QWERTY phones, especially „dumb phones” such as Nokia's C6.
The fact that HTC has expertise in this domain has been proven with the Touch Pro, the Touch Pro 2 and also the Desire Z. You can't argue the fact that 90% of the reviews praised the keyboards on these devices, although some caveats, such as the Desire Z not having a separate numbers row, haven't gone unnoticed.
Apart from the sliding mechanism, think about space. I saw the photos of the dismantled iPhone 4S. The battery in that thing takes about 80% of its space. The motherboard is tiny! I wouldn't be surprised to see something similar in our phones, too. Add in the complexity of a keyboard slider and you've got yourself a compromise a company with a rough financial year such as HTC isn't really willing to take.
To add new, more powerful components, you need space for heat to dissipate. You need space for fancier processors (LTE, new imaging chip, better GPU, etc) and that's already hard when you want to supply a battery which allows the user to enjoy the phone for more than three hours before it's dead. With the complexity needed to add a keyboard, you lose precious space which would be better off filled with mAh's rather than hinges and keys.
This is my take on it. What do you guys think?
Badabing, badabang, badaboom.