That is IMHO not a sensible question to ask, because the markets in question are overlapping, so the market share for those cameras eats into the market share that you are proposing.
The question one should ask is "What and how large is the segment of the market for this that hasn't already been cornered by the Ricoh GRD or the Canon S100".
As far as APS-C or Micro-4/3 or, God heavens, full frame sensors are concerned, I don't think such a segment exists. If you allow for smaller (and hence cheaper) 1" sensors, then Sony, Nikon and possibly Canon (according to rumours) seem to think that such a segment might exist. That said, neither the Nikon 1 nor the DSC-RX100 are exactly pocketable according to your definition.