You're right; one day magnetic recording as we know it will get replaced with flash or some other solid-state storage. The odd thing is the date keeps getting pushed out and magnetic storage keeps chugging along. For all the folks that hate the slowness, the noise, the power consumption, the fragility, etc, etc, gosh darn it, there really isn't a practical substitute for the average user.
And when the day comes HDD's with moving parts are dinosaurs, I hope I'm in another line of work. It was a lot of fun going to DiskCon and seeing the exhibit on drive technology through the years. Of course, it's a little scary when you can tell someone mismatched parts from different companies in the display. 8O