A good program would be one that produced results so the theory doesn't apply to the tahs.
Consistency wise though, the Tahs have been one of the best Australian teams for quite a while now. The result is that they have had a fairly stable and experienced squad which has meant that younger talent struggle to get a run and go to other franchises.
The Reds for instance managed to build an excellent squad with a lot of young talent after spending a few years really struggling. Without those dismal seasons, the Tahs never really get the big player cleanout giving young guys a chance to become regular Super Rugby players.