Such an incentive problem is easy to fix. Simply put the people who do the work at the company in charge. Their incentives are aligned to doing the work well, keeping the business stable, and developing a healthy culture.
I don't think the problem is either Arrivabene or Binotto - it was Marchionne and it's going to take a long time to fix.
For all the credits to Binotto, he's not a good negotiator.