My two cents...
Let's be very clear here, this procedure is not 100% safe. Angioplasty can have complications, and if a stent or other method is used to keep the vein open, this can cause even more complications. Hence the reason, both Canada and the USA, have decided to undertake trials. The veins have a good chance of returning to their prior state if not stented, so this part of the procedure needs to be perfected as stents are made for arteries not veins.

The ccsvi theory makes sense to me, as another condition, or as the reason our immune system is attacking our mylin sheath because of the iron build up in the brain from the blood not flowing out freely.

I don't believe the theory is about lack of oxygen to the brain, this would cause random ischemia, where MS lesions often have a certain characteristic. My understanding is that the theory is that the lack of free flowing blood out of the brain causes iron buildup, causing a certain toxicity, therefore causing the immune system to react and attack the myelin sheath.

Regardless, once permanent damage is done, axions are cut, that is it normally, some myelin will repair, some won't, so full recovery, back to the old days I believe is going to be a rare occurrence. However, if the recovery is 20-30-50%, or it is caught in the early stages that is where I believe our miracles will be.

I hope this helps, and if I have misunderstood some of this, please don't hesitate to jump in to clarify.