I see why they wanted to bring Patrick Duffy back. The conflict between JR and Bobby was interesting. But I don't think it was enough to warrant going through such an insult to the audience as telling them nothing they saw in the previous season happened because it was all a dream. That just killed the credibility of the show and it never recovered. It sort of turned the show into a joke. If you look at it from a ratings standpoint, the season where they brought Patrick Duffy back got lower ratings than the season before it - the one where he was considered to be dead. So killing the show's credibility and having less viewers than the season before tells me it was a mistake to bring him back.