Some earnest talks have occurred, but the bottom line is that the trads reject certain aspects of Vatican II's teaching in the name of traditional Catholicism, even as progs reject certain teachings of traditional Catholicism in the name of Vatican II. If you don't believe me, check out the most recent remarks of an SSPX bishop, Tissier de Mallerais (pictured). And he's moderate compared with his colleague, Bishop Richard Williamson.
These are people who don't consider "more Catholic than the Pope" a joke. They acknowledge it as an honor even as they wish they didn't have to.
History has many ironies in the fire. This one isn't about to be stomped out.