That's far too narrow a test to be useful in assessing research in ME/CFS - we still don't know if we are dealing with a single disease process that is expressed with huge variation across a heterogenous patient population, or a disease process that expresses in multiple subtypes within homogeneous subsets of a heterogenous patient population, or multiple disease processes expressed with huge variation across a heterogenous patient population, or multiple disease processes that expresses in multiple subtypes within homogeneous subsets of a heterogenous patient population, or indeed some horrific multiple of all the preceding. The best we can expect (hope is a different matter) at this point is that each bit of research should take at least a small bite out of a Gas Giant sized problem.I look at Whitney as the 'proof in the pudding'. If he one day gets up and walks outside his house on his own power, I'll know that OMF found something.
Of course no research approach should be beyond criticism - my own view is that what I would characterise as the 'stick a pin in the map' approach and look at that spot under a microscope, is far too reliant on a lucky strike for success, and while GWAS has the possibility of removing or at least vastly narrowing the reliance on a lucky strike to move things forward, I still believe that much more basic research in understanding the who and what of ME/CFS is needed to break the problem into more manageable pieces.