Oh, I’ve got a toddler on my own. I do not have to use the smartphone to get his attention, just sitting at the computer will do that, so the point what I use to enter text is kinda moot.
However, when he’s sleeping in my arm, hitting fn twice and dictate short replies is a great help.
But we’re talking about keyboard with the context Blackberry, i.e. mobile device to be used on the go. Blackberry is famously about direct communication between people, that’s their schtick. And if that includes writing really a lot while on the go, a hardware keyboard is probably better. But this skews their view on the overall market: The vast majority of people do not exchange large texts. I believe even people using forums like BoingBoing are already outliers when it comes to reading and writing texts on the web.
I take part in many discussion boards and yes, I’m using a keyboard. Of course, I got raised on VIC-20, Apple ][ and so on, so a keyboard feels perfectly natural to me, too. Hell, I still do much of my stuff on the command line and edit epubs in emacs.
But when I’m away from my desks, I don’t edit epubs, I don’t code, and so on. Why would I? Even if the tools weren’t the problem, many of these tasks require time to think with no outside interruption. A normal programmer doesn’t like task switches and you can’t avoid those while traveling or walking and so. Same for many other professions, too.
I still do lightweight stuff. Reading mail, sending short replies, deleting mails, checking accounts, answering tweets, scheduling home repairs - a hundred things can be done while away from the desk and those require only minimal text entry, which can still be done by dictation.
Privacy is an issue, of course, but saying “Text my husband I’m coming later“ is not really different from calling my husband and telling him myself.