[javert]

The Linux desktop is dead

This is really premature because there are major flaws with the other options. Apple is a closed-down walled garden (and it's expensive), for example.

The Linux ecosystem is extremely diverse, so maybe somebody will come up with something that can compete well with these other flawed models.

For example, maybe Ingo Molnar's post will inspire people to take things in new directions.

The desktop paradigm will still be around for several years

That's a ridiculous understatement. You can't do serious work on smartphones and tablets and that's not going to change until we're going around plugging them into projectors and keyboards, at which point they're just serving as desktops anyway.