It can't be a crock - Considering ONLY MS patients, and all of them tested so far, have presented a stenosis. I am beginning to think an MS-er w/o a stenosis would be like finding a Brazilian in a swimsuit in the middle of a crowd of 50,000 Eskimos in a field outside of Yellowknife in January.
Though I find the mental image funny, I must respectfully disagree with you sentiment. I think that CCSVI, if proven as a cause(with causes of the stenosis itself to be researched in the future), will finally help end the trash bin diagnosis that is MS. As Lyon often states, MS is not diagnosed with anywhere near 100% accuracy. There are plenty of individuals out there with diagnosed MS that actually have other disorders, and others who likely have lesion formation and consistent symptoms with completely separate etiologies, so you will invariably find 'MSers' without stenosis of any kind.
If all the high hopes for CCSVI pan out, it will 'claim' a certain percentage of MS patients. But there will still be a distinct percentage that still are of unknown origin(linfection, chemical exposure, etc.) We will end up with at least a few new 'tags', perhaps with the term multiple sclerosis referring ony to the stenosis-based disorder.