Give me the option to run desktop apps on it (just a few, a terminal, recompiled open source stuff, self-compiled stuff for my work), and I'll seriously consider buying one.
Edit: Links: "Jail break" tool: http://forum.xda-developers.com/showthread.php?t=2092158
Ported apps: http://forum.xda-developers.com/showthread.php?t=2092348
I know you were trying to say that this should be enabled by default, but I thought you might want to know that it's at the very least possible.
I have one, a ThinkPad Tablet 2, and it's been pretty awesome for me. (It's the computer I'm using to type this reply. I find the Win8 touchscreen keyboard works much better for me than the iPad's ever did.)
The Windows RT is supposed to be competitive with iPads; i.e. they expect developers to re-tool their apps to work well with touch in WPF and/or Silverlight.