Successful performance in sport is all about effective relationships. Whether these are between teammates, the coach and the athlete, or between players, coaches and the support staff the quality of these relationships impacts upon the overall performance that is produced. Indeed, there is a lot of research and applied guidance regarding developing effective relationships in teams (team building) and developing the coach-athlete relationship.
The answer to this in one sense is a simple one. It depends how much time and effort the team are willing to invest, and the degree to which they want Webber to stay. Vettel is undeniably the top driver on the team and has historically received preferential treatment (he is the world champion). The rhetoric coming out of Redbull is that they want to fix this and what Vettel did was wrong, but once done these things can’t be easily undone.
Time will tell, but it is going to be a tough season for Redbull.