Where I see this debate turning is with the company admins who overseee which programs will be the corporate standard. In short, can we "trust" and manage bugs with an "open source" behind our firewal, or do we keep paying SAS a lot for a darn good and generally headache-free product that most people know.
I also believe this is a situation where us old dogs must grow and learn: R and Python should be on everyone's training/education plan if you're a SAS dog.