At least several of these transfers already have played for winning programs and presumably expect to win.
Really, except for a few programs every season, there's not much difference between the vast majority of college basketball teams that play in the major conferences; this sport mostly is made up of average teams, and one player can change an average team into a top 10 team; i.e., Purdue last season would've been a pretty ordinary team without their center. Also, last season, most of the Big 10 consisted of rather ordinary teams, and there was very little difference between the bottom and the top. Just look at how OSU and even PSU made runs in the Big 10 tournament, and they both finished in the bottom third of the conference. Moreover, Northwestern finished second in the conference after they were picked to finish last or close to last in the preseason, and that team never will be confused with the 1976 IU team.
My point regarding the above is, unless these other Big 10 schools all of a sudden are going to bring in Fab 5 recruiting classes, there's no reason why this collection of PSU players can't win about the same number of conference games as last season.