Go ahead and ask some Sask fans, I bet a few of them will tell you they did a happy dance when Jones left.
Your kidding yourself if you think Hervey didn't know that Jones would leave the team for an opportunity to be a GM and head coach. In fact Hervey gave the Riders permission to talk to him. It was only 7 days after Jones left Edmonton that they hired Jason Maas, so I would say they were looking prior to the announcement that he was leaving.
In terms of Saskatchewan, Jones leaving paved the way for Jeremy O'Day to become the GM instead of leaving town for another GM gig and it also gave Craig Dickenson a chance to be a head coach. Craig is now 22-10 which is the best winning percentage as a head coach for the riders since Eagle Keys back in 1970.
Hardly devastating is either case.