Lets put all the theory bickering aside. Move to commercial reality.
Ask a simple question - how much thrust is needed for a cube sat station keeping use?
Here is a highly touted commercial company's product spec sheet http://static1.squarespace.com/static/5 ... ySheet.pdfhttp://www.accion-systems.com/max-1-sma ... product-1/
30 uN thrust
Enough fuel for 10 N s total thrust
75 grams weight
25 cc Volume
Once the fuel is used up - game over
There is your motivation.
A 30 uN EM drive thruster in the 75 grams (low voltage power from the satellite) 25 cc volume class - drawing a few watts has a ready market with reasonable TAM and VC financing available.
Now to revive the theory bickering,
No matter how you look at this - an EM drive is a photon thruster. It generates photons to derive thrust. The bickering is in how the generated photons couple to the quantum vacuum. Since there is very little known about the quantum vacuum how do you couple a generated photon to it? Kind of pointless to bicker - either the EM drive couples to the vacuum more efficiently by bouncing photons than a photon shot off into space does - or not. There is so little known about the vacuum that this experiment is a far better guide to reality than any theory.
If the EM drive couples even a tiny bit more efficiently - this experiment at least yields some information about what the quantum vacuum is and may provide a valuable product with only tens of micro-newtons of thrust.