I believe a COUPLE of these grafts may have taken. I'd recommend this procedure again, but not with such a drastic treatment of the other roots. THAT made this tree sulk for several months, and didn't really see it growing well the next year either. It finally got a full head of steam late this past summer.
I think that the 2 years before it really got going doomed most of these grafts. On another note, there are several new roots that've grown as a result of the drastic reduction of the other roots though.