I was the one who posted on SD about starting up Archbishop Lefebvre's canonization process. There was some opposition, hardly unexpected, but also some support, and there is a prayer thread dedicated almost exclusively for it. There's also an ongoing Rosary crusade where we've come to 2800+ Rosaries. Archbishop Lefebvre will be recognized as a Saint one day. I wish those who had that conviction would already begin asking his intercession. Recently, Archbishop Sheen's beatification process began with a reported miracle.
Why? Because many, many people were asking for his intercession. So in one case, God answered. I wish all would do the same for +ABL.
As for canonization, is it infallible? The question is nuanced. Does the Pope say the person canonized is in heaven? Yes, most definitely. Anything necessarily more than that? The Papal canonization decree only says that the person is in heaven and is to venerated by all.