I think the bigger issues are the coarse resolution of the touch interface and lack of usable keyboard. The former prevents the kind of dense, widget-rich UIs you need for a tool as complex as a real IDE. The latter can be ameliorated with an external keyboard but then you've got a combination that's actually more awkward and less portable than a laptop.

To try replace a laptop with a tablet (or vice-versa) is to misunderstand the strengths and limitations of each, IMO.