Since when has a multi-user unix-like OS excelled at being a consumer-oriented desktop system? Never.
I work with multiple apps at once, especially while coding. I'm guaranteed to be running more than one copy of zsh (tabs in Konsole; usually one is ssh'd to a remote shell server running irssi, also used for development) and Chrome (also for reading docs), Pidgin and GMPC. (on Windows, replace Konsole with one PuTTY window. I do have a working MPD setup under Windows, and even with the same song progress as on Linux.) In order to switch between those apps, I use alt-tab or use the scroll wheel* with my pointer on the panel. And to start them, just click on the four icons which are right next to each other (KDE Icon-Only Task Manager).
Now, what would I have to do on a tablet? Click on the chrome app (and hope it supports tab pinning for apps), then go back home, start a terminal/ssh app. And then I could start SSH and-- oh wait. I cannot use a local shell. And even if I can, I doubt I would ever get my hands on zsh, vim, ncmpcpp, git, python... Sure, I can do half of those things on the remote host, but certain development tasks require a local environment. And I've yet to see a good** MPD client for Android or a good IM.
Okay, so even if I had the apps I need, what about switching? As I said, to get from app to app on a computer, I use alt+tab or my mouse. Now, what should I do on Android?
Add the fact that I like to play some good games. Have you seen any good games for an Android tablet? No, you haven't. And I don't consider Angry Birds or Fruit Ninja or something like that as a good game. Tablets don't have enough resources to have good games. And you won't be able to play too many games on those fancy Windows RT tablets (which are shit.)
* scroll wheel is my preferred method of interaction with tabs and such. I hate that Chrome on Windows doesn’t accept such behavior.
** the only clients I accept on PCs are ncmpcpp and gmpc. Others suck miserably.
[disclaimer: I hate tablets, and I have played with Android tablets for a very short moment. still, try to move my workflow to a tablet.]
Is it really time to ditch Oracle's java and go for an open source VM?
I, for one, got rid of all Java from my machine a long time ago. I think that everyone at slashdot did that too. You don’t know how angered I am when my set-top box has some problems (eg. today it stopped sending audio over HDMI, I needed to set it to standby and wake it up again) or when I got my Kindle today. Both are in Java. Unfortunately.
I don't see a lot of normal people talking in such terms.
Suggest you just sit there and wait till life gets easier.