I don't see an issue with calling it a pipeline, However, we have to have continued success. The starting staff has Ober (from our "pipeline), beyond that I am not certain that we have anything. I do think we have some very good arms on the farm but will it translate. Varland has not been good as a starter in the Majors, and I believe he will/should take Thielbar's position eventually.
I think if we can get continued success with (when brought up), Festa, Raya, Soto, Lewis etc, you can call it a "pipeline".