I am not going to lament much, either. It is just how it goes. On the brighter side, there will also be a minority, who will come to email exactly because they will be aspiring power users. I think there will always be some aspiring power users, so it is not going to be only bad.
There will be, but they will keep dwindling.
Things may be coming to this but they do not have to. I understand that being a power user involves talking to computer with some kind of a language, as opposed to pointing with finger. One example is unix commands, where "ls /usr/bin/ /sbin /usr/sbin/ | wc -l" gives me well over four thousand "words". So the question is, if in a future there will be systems which allow "talking to computer with words", allowing to make complex descriptions of "what to do".
Talking to "siri" is not what I am thinking about, because just like "desktop metaphore", the "assistant metaphore" is trying to hide too much of underlying complexity to allow "power usage”.
Obligatory: Scotty: Computer! Computer? [He's handed a mouse, and he speaks into it] Scotty: Hello, computer. Dr. Nichols: Just use the keyboard. Scotty: Keyboard. How quaint. -Andy