Bold statement. Keep in mind lots of us were balking at the idea of touch screens for even writing text messages when the iPhone came out.. Or jump back less than a lifetime to assumptions about how long it would take to get computers the size of our bedrooms.
Take a step back, and really consider how likely it is that laptops are FOREVER. It might be true, but things change and I think it's historically much more likely that ANYTHING you point a finger at today will be transformatively replaced in due time, than it is that you'll be able to accurately predict a permanent future for whatever an ultrabook is.
I actually don't have any idea what an ultrabook is, but it sounds like a very small idea... not something I'd bet on or invest in for the very long term.
I still hate writing on a touchscreen. It's slow and error-prone. It's only better than not writing at all.
Touchscreens are fundamentally limited by the size of your finger. Firstly because you have to physically press the UI element you want to interact with. Secondly because your finger obscures whatever's underneath.
Of course, you can get around this by decoupling the physical location of the UI element and the physical location of your finger. It's called a trackpad.
Touchscreens are great for some tasks. But they are not great for tasks involving high information densities (writing, spreadsheets, mostly anything that can be classified as "editing"). For those, people will continue to use keyboards and mice until they evolve cone-shaped transparent fingers.
Ultrabooks are MacBookAir-like laptops. Technically the term is an Intel trademark, but it's a widely-accepted synonym for "very thin and light laptop with extra battery life and no optical-disc bay".
As soon as they start to get over the 11-to-13'' form factor (and lower in price), they're going to replace the current generation of work laptops. They'll get thinner and thinner; as batteries and bluetooth-like technologies improve, sooner or later they'll even lose USB ports, and you'll be left with a device that is literally a screen and a keyboard. Some models will have a detachable tablet screen, no doubt, but the heavy lifting will still be done with a real keyboard.
But interestingly, the touch keyboard does suck very badly. It's only because of other factors that I accept the "touch keyboard." But in reality, it's very, very annoying, let's be honest. Pre-iPhone, I texted happily without even looking at the screen. Now, I can never figure out why I keep hitting certain letters that I didn't mean to. I feel like an elderly person typing. And you can google this stuff, it's a very common view. We haven't really innovated with a touch keyboard, we just deal with it. If I had a technology that could let me have a touch experience but give me a tactile keyboard when I need, it would be great. Although, I agree with you on the ultrabook thing, not sure about that.
Take a step back, and really consider how likely it is that laptops are FOREVER. It might be true, but things change and I think it's historically much more likely that ANYTHING you point a finger at today will be transformatively replaced in due time, than it is that you'll be able to accurately predict a permanent future for whatever an ultrabook is.
I actually don't have any idea what an ultrabook is, but it sounds like a very small idea... not something I'd bet on or invest in for the very long term.