Yeah, Days of the Week and the video for it didn't set the proper tone for SLDD's release. I also agree that the FVT didn't help the situation. There are too many factors to seriously speculate, but I've always wondered if things would've changed it SLDD had a hit lead single like Coma.
You know by the articles and interviews we read, in addition to any of the "documentary" footage we saw, that the boys were really together and there was a great vibe in the group while recording SLDD. They poured everything they had into the album, and it essentially flopped (by STP's standards). Then they were put on the FVT. I wonder if that letdown caused some stress and tension, and eventually led to the unravelling of the band. Maybe if they had a hit lead single, the record would have had more support and better follow up singles would have been released. Maybe then STP would have had the leverage to do their own tour, and things would have remained positive in the group like they were recording the album. Success can do a lot to drive people and maintain a team.
I'm not saying that's the case, but I've wondered about it.